I think there are 13 triangles in a 15 sided shape.. Because for convex shapes (Pentagons) You take 2 from how many sides there are in the same. Like 5-2= 3 triangles.. I could be wrong!
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13 triangles will be formed
15
A pentagon is a 5 sided polygon
N is a KABOB
The interiior angles of a 15 sided polygon add up to 2340 degrees