Question

Question 13

We have 4 congruent equilateral triangles. What do we need more to make a pyramid?
(a) An equilateral triangle.
(b) A square with same side length as of triangle.
(c) 2 equilateral triangles with side length same as the triangle.
(d) 2 squares with side length same the as triangle.

Answer 1

We know that a pyramid is a polyhedron, whose base is a polygon and lateral faces are triangles. But in the question, we have only 4 congruent equilateral triangles. Thus, we have to add a polygon to the base of at least a four-sided figure. Hence, option (b) is required to make a pyramid.