Two basketballs can fit inside a hoop, as shown in the drawing below. If each basketball has a circumference of 66 cm. Find the circumference of the hoop. 
Hi Nehali!
Here is the answer to your question.
Let r be the radius of each basket ball.
Circumference of a basket ball, 2πr = 66 cm
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Radius of the hoop = 2 × 10.5 cm = 21 cm
Thus, circumference of the hoop = 2 × π × 21 cm = 132 cm
Cheers!