Предмет: Геометрия, автор: gintuk

Найдите длину окружности, вписанной в правильный треугольник, если его сторона равна 9√3 см. Помогите пожалуйста, срочно!

Ответы

Автор ответа: liftec74

Ответ: 9*pi

Объяснение:

Длина окружности l=2*pi*r . В правильном треугольнике r=1/3*h

h= 9*sqr(3)* cos(30)= 9*sqr(3)*sqr(3)/2= 27/2

r= 1/3*27/2=9/2

l=2*9/2*pi=9*pi

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