Polygon Interior and Exterior Angles
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