In ancient India,the shapes of altars used for household rituals were
(a) squares and rectangles
(b) squares and circles
(c) triangles and rectangles
(d) trapeziums and pyramids
A pyramid is a polyhedron whose base is a polygon and whose lateral faces are triangles with a common vertex.
A pyramid is a solid figure,whose base is
(a) only a triangle
(b) only a square
(c) only a rectangle
(d) any polygon