Question

find the difference of area of sector of angle 120° and it's corresponding major sector of a circle is of radius 21cm

Answer 1

minor sector
angle = 120 degree
r=21cm
area = q/360 x PI x Rsquare
=120/360 x 22/7 x 21 x 21
=1/3 x 22/7 x 21 x 21
=1 x 22 x 21
=22 x 21
=462

Major sector
angle=360 - 120
=240
R = 21 cm
Area = 240/360 x 22/7 x 21 x 21
=2/3 x 22/7 x 21 x 21
=2 x 22 x 21
=480
AREA OF MINOR SECTOR = 240 AND AREA OF MAJOR SECTOR = 480