Question

Find the area of quadrant of a circle whose radius is 21 cm

Answer 1

you try the answer with the Formula 1 by 4 Pi R Square now you steps to the answer as 1 by 4 into 22 by 7 into 21 into 21
$1 \div 4 \times 22 \div 7 \times 21 \times 21$

Answer 2

1/4πr² is the formula so
1/4*22/7*21*21=346.5 is the ans