It is a self-contradictory phrase and such a shape cannot exist.
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A pentagon and a triangle are both polygons. There are three triangles in a pentagon. Both a triangle and a pentagon have exterior angles that add up to 360 degrees
No a pentagon has way more angles than a triangle does.
I think what you are asking is "What type of triangle is formed within a pentagon?" That depends on whether the pentagon is either regular or not, and also by how you plan on making the triangle, specifically between which diagonals of the pentagon. There is not enough information to answer this question.
There are 3 triangles in a pentagon
There are 3 triangles in a pentagon.