Consider a regular polygon that has n sides.
Measure of an exterior angle of the polygon
=360∘n
A regular pentagon has 5 equal sides.
⟹n=5
∴ Measure of an exterior angle of a regular pentagon
=360∘5=72∘
A regular hexagon has 6 equal sides.
⟹n=6
∴ Measure of an exterior angle of a regular hexagon
=360∘6=60∘