The area of a ring whose outer and inner radii are 5 cm and 2 cm is -
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Answer:
66 cm²
Step-by-step explanation:
outer radii = 5 cm
inner radii = 2 cm
Area of a circle = πr² (π means pi & r means radius)
Area of outer ring = π(5)² = (π × 25) cm²
Area of inner ring = π(2)² = (π × 4) cm²
Area of the ring = Area of outer ring - Area of inner ring
∴ Area of the ring = (π × 25) - (π × 4)
⇒Area of the ring = π (25 - 4)
⇒Area of the ring = π (21)
⇒Area of the ring = 22/7 × 21
⇒Area of the ring = 22 × 3
⇒Area of the ring = 66 cm²
(Please mark my answer as brainliest)
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