A triangular prism has two congruent, parallel bases and three lateral sides.
What is a prism?
A prism is a polyhedron that has two n-sided bases and n number of lateral sides. Those two bases are exactly the same.
A pentagon and a rectangle are two dimensional figures. Hence, there are neither parallel bases nor lateral sides. Whereas a prism is a three dimensional figure consists of two congruent, parallel bases and three lateral sides.
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