polygons...yu hav same number av outside anges as inside angels, so the sum
dont hav nuthun tu du with it...just look at 1 av em.
inside+outside=strate line=180 deg
if inside angel =2 times outside, yu hav thirds...60deg & 120 deg
outside angel=senter angel=360 deg/n=60
thus, n=6 (hexagon)