Лучшие помощники
- Megamozg 2180 б
- Matalya1 1800 б
- DevAdmin 1690 б
- arkasha_bortnikov 840 б
- Dwayne_Johnson 840 б
27 августа 2023 01:45
359
В треугольнике ABC AC=BC, sinACD=2/√5, AH и CD высоты. Найдите tgBAH
1
ответ
Для решения данной задачи, нам понадобится использовать теорему синусов и теорему Пифагора.
Из условия задачи, мы знаем, что AC = BC и sin(ACD) = 2/√5.
Так как AC = BC, то треугольник ABC является равнобедренным.
Из теоремы синусов, мы можем записать:
sin(ACD) / CD = sin(CAD) / AC
2/√5 / CD = sin(CAD) / AC
sin(CAD) = (2/√5) * CD / AC
Так как треугольник ABC является равнобедренным, то угол CAD равен углу CBA.
Из теоремы Пифагора, мы можем записать:
AC^2 = AH^2 + CH^2
Так как AC = BC, то CH = BC / 2
AC^2 = AH^2 + (BC / 2)^2
AC^2 = AH^2 + BC^2 / 4
Из условия задачи, мы знаем, что AC = BC, поэтому:
AC^2 = AH^2 + AC^2 / 4
AH^2 = AC^2 - AC^2 / 4
AH^2 = 3AC^2 / 4
AH = √(3AC^2 / 4)
Теперь мы можем найти sin(CAD):
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / BC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD
Из условия задачи, мы знаем, что AC = BC и sin(ACD) = 2/√5.
Так как AC = BC, то треугольник ABC является равнобедренным.
Из теоремы синусов, мы можем записать:
sin(ACD) / CD = sin(CAD) / AC
2/√5 / CD = sin(CAD) / AC
sin(CAD) = (2/√5) * CD / AC
Так как треугольник ABC является равнобедренным, то угол CAD равен углу CBA.
Из теоремы Пифагора, мы можем записать:
AC^2 = AH^2 + CH^2
Так как AC = BC, то CH = BC / 2
AC^2 = AH^2 + (BC / 2)^2
AC^2 = AH^2 + BC^2 / 4
Из условия задачи, мы знаем, что AC = BC, поэтому:
AC^2 = AH^2 + AC^2 / 4
AH^2 = AC^2 - AC^2 / 4
AH^2 = 3AC^2 / 4
AH = √(3AC^2 / 4)
Теперь мы можем найти sin(CAD):
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / BC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD / AC
sin(CAD) = (2/√5) * CD
0
·
Хороший ответ
27 августа 2023 01:46
Остались вопросы?
Еще вопросы по категории Геометрия
Диагональ осевого сечения цилиндра равна 48 см. Угол между этой диагональю и образующей цилиндра равен 30 градусов. Тогда радиус основания цилиндра ра...
Найдите площадь ромба, изображенного на рисунке....
Найдите площадь параллелограмма построенного на векторах а(1;2) b(-3;2)...
помогите 8 класс. CE - биссектриса параллелограмма ABCD . Точка E лежит на стене AD , ED = 3, AE = 5. Найдите периметр параллелограмма....
Чем светлохвойная тайга отличается от темнохвойной? Почему в Средней Сибири распространена именно светлохвойная тайга? ...
Все предметы 
