Предмет: Геометрия, автор: lera0118

Помогите пожалуйста решить 19 и 20 задачу

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Автор ответа: farhadxakerp9n5s9
0
Sбок=h*c
Sбок=10*8=80
farhadxakerp9n5s9: это 20
lera0118: а можно прям подробное решение,пожалуйста!
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