Question

If the diameter of the circle is 30/π cm. Find its circumference.​

Answer 1

$diameter = 30 \div \pi \\ radius = 15 \div \pi \\ circumference = 2\pi \: r \\ \: \: \: \: \: = 2 \times \pi \times 15 \div \: \: \pi \\ = 2 \times 15 = 30$

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