Предмет: Геометрия, автор: annetkndrtnk

2 Завдання. ДОПОМОЖІТЬ СРОЧНОООО

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Ответы

Автор ответа: tim1M

Объяснение:

записываешь условие:

△ABC — рівнобедрений, AB=BC менше АС на 5 см, BF — медіана, ∠ABF=55°, AF=10 см. ∠В — ? АВ=ВС — ?

Розв’язання

У рівнобедиеному трикутнику перпендикуляр, проведений до основи, є медіаною, висотою і бісекртисою.
∠В = 2∠АВF=2*55°=110°;

АF=FC; AC=2AF=2*10=20 (см); AB менше АС на 5 см, АВ=20-5=15 (см).
Відповідь: 110°, 15 см.

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