None unless (for example) you draw lines from each corner to the center, and then you'll have five. But there's an infinite number of ways of drawing isosceles triangles in a pentagon. (Choose any part of one edge, and use that as the base of your triangle, and then choose a height).
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There are 3 triangles in a pentagon
The base is a pentagon. It has five isosceles triangles rising from the sides to a point above it.
3 triangles
5
Isosceles triangles can be used in domes