Question

find the radius of a circle and its area if its circumstances is 16 r cm​

Answer 1

Answer:

$cirumference \: of \: circle = 2\pi \: r \\ 16 = 2 \times 22 \div 7 \times r \\ 16 = 44 \div 7 \times r \\ 16 \times 7 \div 44 = r \\ r = 2.5 \\ area \: of \: circle = \pi \: r {}^{2} \\ = 22 \div 7 \times 2.5 \times 2.5 \\ = 137.5 \div 7 \\ = 19c$