Предмет: Математика, автор: drin86

Помогите пожалуйста срочно нужно умоляю

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Автор ответа: svanidze89andrey43

дано л-длина дуги, л=0.6Р, где Р - периметр окружности. R=5 см.

Р=2ПR=2×3.14×5=31.4 см

л=31.4×0.6=18.84 см. ответ.

дано Р=37.2. найти D.

P=ПD

D=P/П=37.2/3.1=12 ответ.

дано R=10 см. Найти 2/5 S.

S=П(R)^2=3.1×(10)^2=3.1×100=310 см.кв.

2/5S=2/5×310=620/5=124 см.кв. ответ.

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