Предмет: Математика, автор: Айгерим2910

помогите,срочно , доказательство нужно

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Автор ответа: гюйс

Треугольник равнобедренный, следовательно АВ=АС=3 см.
Т.к. ∠АDС=90°, значит АD - высота, а в равнобедренном треугольнике высота является медианой и делит сторону пополам. Следовательно, BD=CD=2 см, а ВС=2*2=4 см.
Р=3+3+4=10 см

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