Question

An arc of a circle is of length 55 cm and the sector 80 pounds has an area of 25 cm square find the radius of circle

Answer 1

Ѳ/360×2πr = 55
80/360×2×22/7×r = 55
r = 55×7×360/80×2×22 =⟩ 25×63/80 =⟩ 1575/80
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