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Q.

We have 4 congruent equilateral triangles. What do we need more to make a pyramid?

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a

equilateral triangle

b

square

c

2 squares

d

2 equilateral triangles

answer is B.

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Detailed Solution

We know that a pyramid is a polyhedron with a polygon as its base and triangle lateral sides.
Let us check for each option.
Check for option (1) An equilateral triangle cannot form a pyramid.
Check for option (2) A pyramid can be formed by a square having the same side length as a triangle.
Check for option (3) A pyramid cannot be formed by 2 squares with the same side length as a triangle.
Check for option (4) A pyramid cannot be formed by 2 equilateral triangles with the same side length as a triangle.
The correct option is (2).

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