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SAT - Math - Geometry

Point A is a vertex of an 8-sided polygon. The polygon has 8 sides

Point A is a vertex of an 8-sided polygon. The polygon has 8 sides of equal length and 8 angles of equal measure. When all possible diagnols are drawn from point A in the polgygon, how many triangles are formed

A- 4
B - 5
C - 6
D - 7
E - 8

Ref to figure below, total number of triangles possible with diagonals from A would be 6