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### Question

What is the ratio of the perimeter of a circle of radius 4 units to that of a square having the circle's diameter as its side?

**A**

π : 4.

**B**

π : 2.

**C**

4 : 3.

**D**

4 : π.

**Soln.**

**Ans: a**

Let X be the radius of the circle, so the side of the square is 2X. The ratio of the perimeters = ${2 × π × X}/{4 × (2X)}$ = π/4.