Question

calcule a area de um circulo em que a circunferencia mede 37,68 cm

Answer 1

$\text{Considerando }\pi=3,14\text{ tem-se:}\\\\A_{\circ}=\pi\cdot\ r^2\longrightarrow A_\circ=\pi\cdot\left(\dfrac{C}{2\cdot\pi}\right)^2\\\\\\A_\circ=3,14\cdot\left(\dfrac{37,68cm}{2\cdot3,14}\right)^2\\\\\\A_\circ=3,14\cdot\left(\dfrac{37,68cm}{6,28}\right)^2\\\\\\A_\circ=3,14\cdot(6cm)^2\\\\\\A_\circ=3,14\cdot36cm^2\\\\\boxed{A_\circ=113,04cm^2}$