The area of a ring having outer radius R and inner radius r is
(a) π(R - 1) (b) π(R2 – r) (c) πR2 (d) None of these
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Given: a ring having outer radius R and inner radius r is
To find : area of the ring
Solution:
Area of a circle = π ( radius)²
area of ring = Total area - inner area
Total area = πR²
Inner Area = πr²
area of ring = πR² - πr²
= π(R² - r²)
area of ring = π(R² - r²)
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