If a sector of a circle has its radius equal to 21cms and its area is 115.5 sq cms.find the length
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Answer:
r = 21 cm
Θ = 120°
The length of arc = 2πr x θ/360
= 2 x 22/7 x 21 x 120/360
= 44 cm
Area of Sector = πr² x θ/360
= 22 x 21 = 462cm²
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