Question

a circle with a radius of 9cm sits inside another circle with a radius of 11cm. what is the area of the shaded region?

Answer 1

Answer:

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Step-by-step explanation:

π(11²-9²)

3.14 ×(121-81)

30×3.14

94.2 cm²

Answer 2

Answer:

Let r = 9cm

Let R = 11cm

Thus, area of smaller circle = πr² = (22×9)÷7 = 198/7 cm²

Thus, are of larger circle = πR² = (22×11)÷7 = 242/7 cm²

Thus, area of shaded region should be = larger area - smaller area

                                                                 = 242/7 - 198/7 = 44/7 cm²