Question

find the area of a circle having circumference 84​

Answer 1

Given;

$circumference \: = 84 \: cm \\ w.k.t. = > circumference \: = 2\pi r \\ 2\pi r = 84 \\ 2 \times (22 \div 7) \times r = 84 \\ = > (44 \div 7) \times r= 84 \\ = > r = 84 \times (7 \div 44) \\ = > r = 13.3636 \: approx \\ or \: r = 13.36 \\ w.k.t. \: area \: of \: circle \: = \pi r {}^{2} \\ area \: = (13.36) {}^{2} \\ area \: = 178.4896 \: approx. \\ = > \: area \: = 178.5 \: cm {}^{2} \: approx.$

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Answer 2

A≈561.5

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