Find the area of circular ring whose external and internal diameters are 20cm and 6 cm respectivel.
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Answer:
286
Step-by-step explanation:
The radiuses are 10 and 3
Area of ring = π(R * R - r * r)
= 22/7 (100 - 9)
= 22/7 * 91
= 22*13
=286
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