a sector is cut from a circle of diameter 21 cm if the angle of sector is 150 find its area
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Step-by-step explanation:
Diameter = 21
So, area of sector= pi (d/2)^2 *150/360
= 22/7 * d^2/4 * 5/12
= 22/7 * 21^2/4 * 5/12
= 22/7 * 441/4 * 5/12
= 11 * 63/2 * 5/12
= 693/2 * 5/12
=3465/24
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