Question

The diameter of the larger circle is 10.5 cm. The diameter of the smaller circle is 4.5 cm.

What is the best approximation for the area of the shaded region?

Use 3.14 to approximate pi.

70.7 cm²

86.5 cm²

102.4 cm²

282.6 cm²

Answer 1

4.5 / 2 = 2.25cm radius for the smaller circle

3.14 (pi) × 2.25² = 15.89625cm²

10.5 / 2 = 5.25cm radius for the larger circle

3.14 × 5.25² = 86.54625cm²

86.54625 - 15.89625 = 70.65cm²

The answer is 70.7cm².