Pls answer this question pls! will give brainliest! pls include estimated answer and exact answer pleaseee
whoever answers this gets 15 points!!!

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Round each decimal to the nearest thousandth. a. 5.39562 b. 0.12345 c. 5634 d. 18.93763

Factor this polynomial completely. x^2-8x+12