Question

qual a área de cada um.​

Answer 1

Área do setor circular com ângulo em graus

$\boxed{\boxed{\mathtt{A=\dfrac{\pi{R}^{2}.\alpha}{360^{\circ}}}}}$

a)

$\alpha=60^{\circ}$

$\mathtt{A=\dfrac{\pi.{20}^{2}.60^{\circ}}{360^{\circ}}}$

$\mathtt{A=\dfrac{\pi.400.60^{\circ}}{360^{\circ}}}$

$\mathtt{A=\dfrac{200\pi}{3}{cm}^{2}}$

b)

$\alpha=80^{\circ}$

$\mathtt{A=\dfrac{\pi.{15}^{2}.80^{\circ}}{360^{\circ}}}$

$\mathtt{A=\dfrac{\pi.225.80^{\circ}}{360^{\circ}}}$

$\mathtt{A=50\pi{cm}^{2}}$