Question

Determine a área do setor, com B=180º e R= 10 cm? Responde?

Answer 1

Area =π $r^{2}$ / 2
Area =3,14x$10^{2}$ / 2 =3,14x 100  / 2 = 157 $cm^{2}$

Answer 2

Ф = B = 180º

$\dfrac{\phi }{180} * \dfrac{ \pi *r^2}{2} \\ \\ \\ \dfrac{180 }{180} * \dfrac{ 3,14 *10^2}{2} \\ \\ \\ 1 * \dfrac{ 3,14 *100}{2} \\ \\ \\ \dfrac{ 3,14 *100}{2} \\ \\ \\ \dfrac{ 314}{2} \\ \\ \\ => 157 cm^2$