Question

calcular el area de un circulo si su perimetro es 30m .

Answer 1

$30 = 2\pi \times r$

$\frac{30}{2} = \pi \times r \\ \ 15 = \pi \times r \ \ \\ r = \frac{15}{\pi}$

A = pi x r ^2
A = pi x (15/pi)^2
A= pi x 225/pi^2
A =225/pi
A=225/3,14
A=706, 5m ^2