Question

find the radius of a circle whose circumference is 57.2 CM

Answer 1

$2\pi \: r \\ 2 \times 22 \div 7 \times 57.7 \\ = 2 \times 3.14 \times 57.2 \\ = 6.28 \times 57.2 \\ = 359.21$
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Answer 2

solution is in the attachment.