The base of a pyramid only has four sides, as it is a square.
That is so not true. A tetrahedron is a pyramid with a triangular base. A pyramid can have any polygon as its base.
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because the the sides of a based form a face of a pyramid
A pyramid has only one base.
This pyramid would have a perpendicular height of 3, a volume of 64 units3 and a slant edge of 6.403
A square-based pyramid - line the ones in Egypt - has four edges on its base and four vertical edges rising from the base to the apex - so it has 8 edges.
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