Длина окружности равна 38пи см. найдите её диаметр и площадь соответствующего круга.
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01.03.2019 01:20
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длина окружности равна l=2*pi*r
радиус окружности равен r=l\(2*pi)
r=38*pi\(2*pi)=19 cм
диаметр окружности равен d=2*r
d=2*19=38 cм
Площадь соотвествующего круга равна
S=pi*r^2
S=pi*19^2=361*pi
ответ: 38 см, 361*pi см^2