Polygon Interior and Exterior Angles

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Concave Polygon

"caves in" ... at least one diagonal can be drawn on the exterior of the polygon

What is the measure of each interior angle of a regular Pentagon?

108

What is the measure of each exterior angle of a regular triangle?

120

What is the sum of the interior angles of a regular nonagon?

1260

What is the measure of an interior angle of a regular octagon?

135

What is the sum of the interior angles of a decagon?

1440

What is the measure of each interior angle of a regular dodecagon?

150

What is the measure of each exterior angle of a regular decagon?

36

What is the sum of the exterior angles of an octagon?

360

What is the sum of the interior angles of a pentagon?

540

What is the measure of each interior angle of a regular triangle?

60

What is the measure of an exterior angle of a regular pentagon?

72

What is the sum of the interior angles of a hexagon?

720

What is the measure of an exterior angle of a regular quadrilateral?

90

Convex polygon

all diagonals are located on the inside of the polygon

Regular polygon

equilateral and equiangular


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