A tetrahedron is a pyramid whose base is a triangle         (b)  square      (c)  rectangle   (d)  quadrilateral

Tetrahedron a tetrahedron is a pyramid whose base is a a triangle.It has six edges and four faces all triangular.

Find the number of vertices of a pyramid, whose base is a pentagon.

A quadrilateral whose each angle is a right angle is a square (b) rectangle rhombus (d) parallelogram

A quadrilateral having each angle is a right angle and whose all sides are equal is a square (b) rectangle (c) rhombus (d) parallelogram

State the number of lines of symmetry for the following figures. (a) An equilateral triangle (b) An isoseles triangle (c ) A scalene triangle (d) A square (e ) A rectangle (f) A rhombus (g) A parallelogram (h) A quadrilateral (i) A regular hexagon (j) A circle

Triangular pyramid a pyramid is called a triangular pyramid if its base is a triangle.

Triangular pyramid a pyramid is called a triangular pyramid if its base is a triangle.