(n-2)180,side,square,dodecagon,hexagon,leg,parallelograms,trapezoid,congruent,a triangle,supplementary,equalateral,midpoint,12,rhombus,n-gon,concave polygon,thanks! type another,nonagon,isosceles trapezoid,octagon,parallelogram,opposite sides congr,triangle,opposite sides paral,rectangle,a congruent square,kite,diagonals bisect eac,triangle, x-2x180,diagonal,leg of a trapezoid,a hexagon,a line,isosceles,dial,convex polygon,regular polygon,bisect,(n-2) 180 over n,nathan is nathan,