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1

triangle

3 sides

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2

quadrilateral

4 sides

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3

pentagon

5 sides

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4

hexagon

6 sides

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5

septagon (or heptagon)

7 sides

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6

octagon

8 sides

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7

nonagon

9 sides

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8

decagon

10 sides

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9

elevenagon

11 sides

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10

dodecagon

12 sides

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11

equation for: sum of interior angles of a n-gon

(n-2)180

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12## (n-2)180

equation for: one interior angle of a regular n-gon

n

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13

sum of exterior angles of any convex polygon

360 degrees

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14

equation for: one exterior angle of a convex polygon

360/n

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15

equation for: finding the number of sides

360/exterior angles

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