The base shape of this prism is a triangle option the third triangle is correct.
What is a triangular prism?
When a triangle is, stretch it out to produce a stack of triangles, one on top of the other. A triangular prism is the name given to this novel 3D object.
As we know from the definition a triangular prism has a total of five faces. Three rectangular lateral faces and two triangular bases are present.
And in the, figure there is a triangular prisms shown so the base shape of the prism would be a triangle.
Thus, the base shape of this prism is a triangle option the third triangle is correct.
Learn more about triangular prisms here:
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