Question

find area of quadrant of circle if circumference of circle 22cm

Answer 1

2 pi r= 22
pi r= 11
22/7 r=11
r= 11*7/22
 = 7/2 cm
Area of quadrant = πr²÷4
                            = (22/7)*(7/2)*(7/2)/4
                            = 9.62 cm²

Answer 2

$2 \times \pi \times r = circumference \: of \: circle$
2×22/7×r=22
r=22×7/2×22
r= 7/×cm
r= 3.5 cm
area of quadrant=1/4×pie×rsquare
=1/4×22/7×3.5×3.5 cm square
=1/4×22/7×12.25 cm square
=1/2 × 11 ×1.75 cm square
=19.25/2 cm square
=9.625 cm square