A triangular based pyramid has 4 vertices. One of them is an appex (the vertex at the top), but in a test you should just put it has 4 vertices :)
Also don't put the smiley face either ;)
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a triangular based pyramid has 4 faces.
A triangular based pyramid has 4 vertices, 6 edges and 4 faces
A triangular based prisim has four faces.
A triangular based pyramid has 4 sides. 3 triangle sides and 1 Square base
A triangular based pyramid has 4 faces, 6 edges and 4 vertices