Solution: The sum of the interior angle of polygon is 2,520°. How many are the sides?

Solution: A polygon has 170 diagonals. How many sides does it have?

Solution: The area of a regular decagon inscribed in a circle of 15 cm diameter is

Solution: The area in the circle not covered by hexagon is

Solution: How many diagonals does a pentedecagon have

Solution: The sum of the interior angles of a polygon of n sides is 1080°

Solution: Find the number of sides

Solution: Each interior angle of a regular polygon is 165°. How many sides?

Solution: Find the area of the shaded portion shown if AB is parallel to CD

Solution: Determine the area of the quadrilateral having (8, -2), (5, 6), (4, 1), and (-7, 4)