the area of a circle is 1386 sq.cm, find its circumference its a hundered point question
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Answered by
239
Area of circle = πr² = 1386 cm²
πr² = 1386
22/7 x r² = 1386
2/7 x r² = 126
r²/7 = 63
r² = 441
r = 21 cm
circumference = 2πr = 2 x 22/7 x 21 = 44 x 3 = 66 x 2 = 132 cm
πr² = 1386
22/7 x r² = 1386
2/7 x r² = 126
r²/7 = 63
r² = 441
r = 21 cm
circumference = 2πr = 2 x 22/7 x 21 = 44 x 3 = 66 x 2 = 132 cm
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Answered by
184
Given,
that area = 1386 cm²
rea of circle = πr²
so,∴ πr² = 1386
r² = 1386×7/22
r2= √441 cm
∴ r = 21 cm
Circumference of the field= 2πr = 2 x 22/7x 21
= 132cm.
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