Figure A is triangular pyramid.
Figure B is rectangular prism.
Figure C is triangular prism.
Figure D is rectangular pyramid.
Rectangular Prims:
A rectangular prism can be defined a 3-dimensional solid shape shape which has six faces that rectangles.
Triangular Prism:
A triangular prism is a three-sided prism, it is a polyhedron made of made of triangular base, a translated copy, and 3 faces joining corresponding sides. A right triangular prism has rectangular sides.
Rectangular Pyramid:
A rectangular pyramid is a type of pyramid with the base shaped like a rectangle but the sides are shaped like triangle. A pyramid usually has triangular sides but with different bases such as a square pyramid or a hexagonal pyramid.
Triangular Pyramid:
A triangular pyramid is a pyramid which has a triangular base. They have 6 edges, four vertices and four faces.
According to the given figures
Figure A is a triangular pyramid because it has a triangular base, 6
edges and 4 faces.
Figure B is rectangular prism because it has a six faces that are rectangles.
Figure C is a triangular prism because it has five faces - two triangular and three rectangular, nine edges , six vertices, and triangular bases that are congruent to each other.
Figure D is a Rectangular Pyramid because it has total five faces ,five vertices, and eight edges.
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