Formula to calculate the possible lines without overlapping Draw polygons with 3,4,5,6,7 and 8 sides and on them draw all the possible triangles without overlapping. Find a formula that relates the number of triangles to the number of sides. I only need the formula please :)

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter3: Triangles
Section3.1: Congruent Triangles
Problem 6E: In a right triangle, the sides that form the right angle are the legs; the longest side opposite the...
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Formula to calculate the possible lines without overlapping

Draw polygons with 3,4,5,6,7 and 8 sides and on them draw all the possible triangles without overlapping. Find a formula that relates the number of triangles to the number of sides.

I only need the formula please :)

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