(Q3) Find the area of sector , whose radius is 7 cm. with the given angles.

(i)60°   (ii)30°  (iii)72° (iv)90° (v)120°

Radius-r Angle-x°
Area of the sector =
x
360
 × πr2
(i) 7cm 60°
360
 ×
22
7
 ×7×7 =
154
 = .66 cm2
(ii) 7cm 30°
360
 ×
22
7
 ×7×7 =
154
 = .83 cm2
(iii) 7cm 72°
360
 ×
22
7
 ×7×7 =
154
 = .8 cm2
(iv) 7cm 90°
360
 ×
22
7
 ×7×7 =
154
 = .5 cm2
(v) 7cm 120°
360
 ×
22
7
 ×7×7 =
154
 = .33 cm2