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05.05.2020 09:19

PA - перпендикуляр к плоскости параллелограмма ABCD, PB ⊥ BC.

1) Определите вид параллелограмма ABCD.

2) Найдите расстояние от точки P до плоскости параллелограмма, если AD = 6 см, AB = 8 см, PC = 26 см.​

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Ответ:
ExKise
09.03.2022 00:50

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Ответ:
Zarxis
22.02.2021 15:52

∠CDE составляет одну часть, ∠ADE - 8 таких частей, всего 9 частей.

∠CDE = 90° : 9 = 10°

Сумма острых углов прямоугольного треугольника 90°, тогда из ΔCDE:

∠DCE = 90° - ∠CDE = 90° - 10° = 80°

Диагонали прямоугольника равны и точкой пересечения делятся пополам, тогда ΔCOD равнобедренный (CO = OD), значит углы при его основании равны:

∠OCD = ∠ODC = 80°.

В ΔOCD находим третий угол:

∠COD = 180° - (∠OCD + ∠ODC) = 180° - 160° = 20° - угол между диагоналями.

Объяснение:

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