Polygons by name:

• A 3-sided polygon is called a TRIANGLE

• A 4-sided polygon is called a QUADRILATERAL

• A 5-sided polygon is called a PENTAGON

• A 6-sided polygon is called a HEXAGON

• A 8-sided polygon is called an OCTAGON

• A 9-sided polygon is called a NONAGON

• A 10-sided polygon is called a DECAGON

• A 11-sided polygon is called an UNDECAGON OR HENDECAGON

• A 12-sided polygon is called a DODECAGON

​Special Polygons

​Interior Angles of Polygons

​Polygon Exterior Angles

​Polygon Exterior Angles

​Polygon Exterior Angles

​Find the value of x.

​Polygon Interior/Exterior Angles

​The trampoline is shaped like a regular dodecagon. Find the measure of each:

a. Interior Angle _________

b. Exterior Angle _________

​Polygon Interior/Exterior Angles

​The trampoline is shaped like a regular dodecagon. Find the measure of each:

a. Interior Angle _________

b. Exterior Angle _________

​Hint: If you know the measure of an interior angle of a regular polygon, you can find the measure of each exterior angle by subtracting from 180. The interior and exterior angles form a Linear Pair!

​Assignment...

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Complete "Angles in Polygons"

Mathematics | Geometry