Предмет: Геометрия, автор: Alex364

В треугольнике ABC угол C=90 градусов. AB=5, tgA=7/24 Найти AC.

Помогите, пожалуйста, а то у меня не получается:(

Ответы

Автор ответа: tanya2512
5
АС=АВ*сos A
1+tg² A=1/cos² A
cos A=1/√(1+tg² A)=1/√(1+(7/24)²)=1/√625/576=24/25
AC=5*24/25=24/5=4,8
Alex364: Спасибо, а вот этот еще можете помочь решить http://znanija.com/task/12009544 пожалуйста?
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