Since the pentagon is a regular<span> pentagon, the </span>measure<span> of each </span>interior angle<span> will be the same. To </span>find<span> the size of each </span>angle<span>, divide the sum, 540º, by the number of </span>angles in<span> the pentagon. (which is the same as the number of sides). There are 108° in each </span>interior angle of a regular<span> pentagon.</span>