If the circumference of a circle is 22 cm, find its radius.
Correct: A
The circumference of a circle is given by the formula C = 2πr, where C is the circumference and r is the radius. We are given that the circumference is 22 cm. Substituting this value in the formula, we get 22 = 2 * (22/7) * r, which implies r = 22 * 7 / 44 = 3.5 cm.