Question

What is the formula in polygon 3-20?

Answer 1

Polygon Formulas
(N = # of sides and S = length from center to a corner)

Area of a regular polygon = (1/2) N sin(360°/N) S2

Sum of the interior angles of a polygon = (N - 2) x 180°

The number of diagonals in a polygon = 1/2 N(N-3)
The number of triangles (when you draw all the diagonals from one vertex) in a polygon = (N - 2)

Answer 2

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Polygon Formulas
(N = # of sides and S = length from center to a corner)

Area of a regular polygon = (1/2) N sin(360°/N) S2

Sum of the interior angles of a polygon = (N - 2) x 180°

The number of diagonals in a polygon = 1/2 N(N-3)
The number of triangles (when you draw all the diagonals from one vertex) in a polygon = (N - 2)


Sides ------- Name

n ------- N-gon

3 ------- Triangle

4 ------- Quadrilateral

5 -------- Pentagon

6 -------- Hexagon

7 --------- Heptagon

8 ---------- Octagon

9 -----------. Nonagon

10 ----------- Decagon

11. -----------. Undecagon

12 ----------- Dodecagon

13 ----------- Tridecagon

14 ----------- Tetradecagonecagon

15. -----------. Pentakaidecagon

16 ------------ Hexadecagondecagon,

17 ------------- Heptakaidecagon

18 ----------- Octadecagondecagon,

19 ---------- Enneakaidecagon

20 ----------- Icosagon


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