find area of Ring of two concentric circle of radius 20 cm and 15 CM
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Answer:
550cm²
Step-by-step explanation:
Area of ring=22 (R²-r²) ÷ 7
=22 (20² - 15²) ÷ 7
=22 (400-225) ÷ 7
=22×175 ÷ 7
= 3850 ÷ 7
= 550cm²
Hope this helps you dear.
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