A pyramid with a square base has 5 corners.
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5 faces 9 edges 6 corners
Each square has four corners, and each triangle has three corners. 5 squares X 4 corners/square = 20 corners 3 triangles X 3 corners/triangle = 9 corners 20 + 9 = 29 corners total.
pentagonpentagon?
a cube
A pentagon