Предмет: Геометрия, автор: Gemdis

Люди умные помогите пожалуйста очень срочно

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Автор ответа: Warlock1

0

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Объяснение:

<AMB - смежный к <АМС => <AMB=180-120=60°

B △АВМ <ABM=180-<AMB-<BAM=180-60-60=60° => △АВМ - равносторонний, значит АМ=АВ=ВМ. Тогда периметр P=3*AM=3a

В равностороннем тр-ке биссектриса любого угла является также высотой, значит BL⊥АМ, чтд.

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