Question

find the measure of an interior angle and the measure of an exterior angle for the regular polygon. 20-gon.

Answer 1

i guess jimmyrep solved this for u.
but yea, it is 160 and 20 , exterior and interior respectively :)

Answer 2

180 +(360/20) = exterior angles = 198

360-198 = interior angles = 162

Answer 3

that last bit was for an 18-gon

Answer 4

180 +(360/18) = 200 ext
360 - 200 = 160 ints