Question

CALCULE A MEDIDA DO ANGULO EXTERNO DE UM ICOSÁGONO REGULAR

Answer 1

Angulo externo= 360/12= 30

Answer 2

$\large\displaystyle\boxed{\begin{array}{l} \sf \: a_e = \dfrac{360 {}^{ \circ} }{n} \\ \\ \sf \: a_e = \dfrac{360 {}^{ \circ} }{20} \\ \\ \boxed{ \boxed{ \sf{a_e = 18 {}^{ \circ} }}}\end{array}}$