A metal wire is bent into the form of a circle of radius 21 cm. If it is rebent into a square, what is the length of a side?
Show answer & explanation
Correct answer: A
Explanation
Radius of the circle = 21 cm
Circumference of the circle = 2πr
Perimeter of the square = 4a
Circumference of the circle = 2 × (22/7) × 21 = 132
4a = 132
a = 132 / 4 = 33 cm