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Triangle

3 sides

Quadrilateral

4 sides

Pentagon

5 sides

Hexagon

6 sides

Heptagon

7 sides

Octagon

8 sides

Nonagon

9 sides

Decagon

10 sides

Dodecagon

12 sides

Pentadecagon

15 sides

How Find The Sum Of Interior Angles

180(n-2)

Sum Of Exterior Angles of a Polygon

360

n(n-3) divided by 2

Number of Diagonals

Characteristics of REGULAR Polygon

all sides congruent and all angles congruent

Measure of each exterior angle of an equiangular polygon

360 divided by n