A polygon with n sides, and n triangles, where n ≥ 3. Most commonly, the polygon at the base is a triangle or a square.
If the base polygon is regular and the pyramid is a right pyramid (ie apex above the centre of the basal polygon), the triangles will be isosceles.
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A triangle and a square
identify 3-dimensional shapes? cone,prism,,pyramid,cylinder,and sphere?
A rectangle and 4 triangles.
pyramid
To make a rectangualr pyramid,you need a rectangle for the base, and four triangles on the sides.