The formula used to find the number of diagonals in a polygon is n(n-3)/2.
30 x 27/2 = 810/2 = 405 diagonals.
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A 30 sided polygon contains 28 triangles.
A 30-sided polygon is called a triacontagon.
A 30 sided polygon is called a Triacontagon.
It's a triacontagon.
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