rectangle
8
Regular polygons have congruent angles such as squares and equilateral triangles.
Only if it is a regular tetrahedron, regular octahedron, or regular icosahedron. All other geodesics have isosceles triangle faces, not equilateral triangles.
pyramid
Because it does't have 4 equal sides and 4 equal angles as for example such as a square.
Regular polyhedra, dipyramids in which all the triangles are congruent and isosceles (so the shape is not regular), rhombic hexahedron are some examples.In fact even a right hexahedron - a cuboid - has six faces that are all rectangular. The rectangles may not be the congruent but they are all the same type of face.
They are said to be regular polygons such as equilateral triangles, squares and other polygons that have congruent sides and equal congruent interior angles.
A REGULAR SQUARE PYRAMID.
Regular polygons such as squares and equilateral triangles
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
It depends - Quadrilaterals such as Squares are regular. Others, like the rectangle or other 'wierd' or irregular shapes aern't... Since regular polygons have, by definition, congruent sides and congruent angles, the only quadrilaterals that would be regular are squares. Rectangles have 4 congruent angles, but their sides are not all congruent, so it wouldn't count. Similarly, the only regular triangles would be equilateral triangles, since they are the only ones with all sides and all angles congruent.
a prism is constructed from two parallel and congruent regular polygons. with vertices joined by edges of length equal to that of the polygons a pyramid has a square base and has 4 triangle joining at a vertex above the centre of the square base. the triangles are isosceles triangles (and can even be equilateral)