Angles of a polygon

Find the sum of the angles of a decagon.

What is the name of a polygon with 8 sides?

Find the sum of the exterior angles of a 20-gon.

If each exterior angle of a regular polygon is 10 degrees, how many sides does the polygon have?

If each interior angle of a regular polygon measures 120 degrees how many sides does the polygon have?

Five of the angles of a hexagon have measures of 100, 120, 130, 140 and 110. Find the measure of the sixth angle.

Find the interior angle sum and the exterior angle sum of a thirteen-sided polygon.

Which of the following is convex?

Which of the following is non-convex

Which of the following is not a polygon?