7.1 - Formulas, Vocab/Definitions, Polygon Names/# of sides

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Last updated 9:57 PM on 6/22/26
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16 Terms

1
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Sum of Interior Angles

Sum = (n - 2) x 180

2
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Each Interior Angle

(n-2) x 180/n

3
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Sum of Exterior Angles

Always = 360

4
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Each exterior Angle

360/n

5
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Regular Polygon

A polygon that is both equilateral (all sides congruent) and equiangular (all angles congruent). It must also be convex

6
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Interior vs Exterior

Interior angles are inside the polygon; exterior angles are formed by extending a side beyond the vertex

7
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Linear Pair Relationships

The interior angle and its adjacent exterior angle at the same vertex always add up to 180

8
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Triangle

3

9
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Quadrilateral

4

10
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Pentagon

5

11
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Hexagon

6

12
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Heptagon/Septagon

7

13
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Octagon

8

14
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Nonagon

9

15
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Decagon

10

16
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Dodecagon

12