Предмет: Геометрия, автор: bobodododo

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Найти S трапеции

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Автор ответа: Vilmar
0
угол ABH=120-90=30⇒
AH=3 см ,тогда AD=12 см
BH²=AB²-AH²=6²-3²=36-9=27
BH=3√3 см
S=(AD+BC)/2*BH=(12+6)/2*3√3=27√3 см²
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