Question

Calculate the area of the circular pathway formed by two concentric circles having the following radii a)R=20cm,r=6cm

Answer 1

$22 \div 7 \times (20 { }^{2} - 6 { }^{2} )$
$22 \div 7 \times 364$
answer will be
$1144 \: cm {}^{2}$