triangular pyramid. how do you not know. >:/
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Very amusing but, if the person who wrote the first answer was less bent on being sarcastic, s/he could have given the proper answer: it is called a tetrahedron.
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A TRIANGLE based PYRAMID is called a tetrahedron.
a triangular based pyramid
A pyramid with a triangular base is a tetrahedron
A triangle if it is a triangular based pyramid
octagonal based pyramid