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(Take `pi` =22/7)
A sector of a circle of radius r has angle θ subtended at the centre. Calculate the area of the sector if:
(a) r = 1.4 cm, `theta` = 30°
(b) r = 2.1 cm, `theta` = 45°
(c) r = 8 cm, `theta` =33°
(d) r = 8.4 cm, `theta` = 60°