Question

Find ciclefrence whose radius is 3.5cm

Answer 1

hope it helps you.............

Answer 2

We know that
$circumference = 2\pi \: r \\ = 2 \times 22 \div 7 \times 3.5 \\ = 0.5 \times 2 \times 22 \\ = 22cm \\ hence \: circumference =22cm$