Предмет: Математика, автор: nosok556677

помогите подалуйста ​

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Автор ответа: vladkalinku
0

Ответ:

Площадь клумбы состоит из 2 площадей кругов и площади- квадрата.

Дано:

Sкл.=1210 м²

π≈3

Решение

Формула нахождения площади круга

Sкр=πr²

Формула нахождения площади квадрата

Sкв.=d², где d сторона квадрата и диаметр окружности.

d=2r

2Sкв.=4r²

Sклумбы=2πr²+4r²

r²(2π+4)=Sкл.

r²=Sкл/(2π+4)

r²=1210/(2*3+4)=1210/(6+4)=1210/10=121

r=√121=11 cm

d=2r=11*2=22cm сторона квадрата

Длина забора=2С, где С длина Окружности

Формула нахождения длины окружности.

С=2πr=d*π

С=22*3=66

2C=66*2=132 cm длина декоративного забора

Ответ: длина декоративного забора равна 132см; радиус полукругов равно 11см; сторона квадрата равная 22см

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