Question

Indique o angulo interno de um eneagono

Answer 1

A soma dos angulos internos= 180x7=1260°1260/9=
140°

Answer 2

$\large\displaystyle\boxed{\begin{array}{l} \sf \: a_i = \dfrac{(n - 2) \cdot180 {}^{ \circ} }{n} \\ \\ \sf \:a_i = \dfrac{(9 - 2) \cdot180 {}^{ \circ} }{9} \\ \\ \sf \:a_i = \dfrac{7 \cdot180 {}^{ \circ} }{9} \\ \\ \sf \:a_i = \dfrac{1260}{9} \\ \\ \boxed{ \boxed{ \sf{a_i = 140 {}^{ \circ} }}}\end{array}}$