Question

calcule a area do circulo que tem diametro igual a 20 cm. use π=3,14

Answer 1

diametro=20. raio=10
A= πr^2
A=3,14×10×10
A=314

Answer 2

Area=$\pi$r² = 3.14 x 10² = 3.14 x 100 = 314cm²