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The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is
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- 4140π sq. cm.
- 4110π sq. cm.
- 4080π sq. cm.
- 4050π sq. cm
- 4140π sq. cm.
Correct Option: A
R1 = 68 cm.
R2 = 22 cm.
Area of the shaded region
= π(R1² – R2²)
= π(R1 + R2) (R1 – R2)
= π (68 + 22) (68 – 22)
= π × 90 × 46 = 4140p sq. cm.
