Yes. They have perpendicular bisectors in the four triangles that make up four of the five sides of a square-based pyramid
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In a triangular based pyramid, the three faces that form the base are perpendicular to the apex of the pyramid, which means they have pairs of perpendicular sides. The other three faces, which are triangular, do not have pairs of perpendicular sides.
A square pyramid.
A square based pyramid has 5 corners - 4 for the square and 1 for the top of the pyramid.
A square based pyramid.
The volume for any pyramid = 1/3*base area*perpendicular height