find a circumference of a circle whose area is 4 times the area of a circle with diameter 21
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ans:The answer for this question is 65.97
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Answer:
D=21
r=21/2
Area of circle = 4×area of circle with diameter 21
= 4×πr²
= 4×22/7 × 21/2 ×21/2
= 38808÷28
= 1386 unit ²
area of circle =1386
πr² = 1386
22/7× r² = 1386
r² = 1386×7/22
r² = 9702÷22
r² = 441
r² = 21²
r = 21 units
circumference of circle = 2πr
= 2×22/7 ×21
= 132 unit
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