A pyramid could have any number of right angles between, and inlcuding, none and 8.
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There are no right angles (90 degrees) in a hexagonal pyramid.
four
A square pyramid has a total of 8 angles. Each of the 4 triangular faces has 3 angles, totaling 12 angles. However, 4 of these angles are shared where the faces meet at the base, resulting in a total of 8 unique angles in a square pyramid.
A square has 4 right angles.
4 right angles