I know the answe its -22/5 but it says its wrong i dont why can someone please help me.

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.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

Which point has an coordinates of (2,0) ? a