the perimeter of the circle with centre o is 24cm the angle formed by an arc of circle at its centre 30 degrees find the length of the arc AB
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perimeter of the circle = 2πr
24=22/7×2×r
24=44/7×r
r=24×7/44
r=6×7/11
r=42/11
perimeter of the arc of a sector=theta/360×2πr
30/360×2×22/7×42/11
=1/12×44/7×42/11
=1/12×4/7×42
=1/6×4/7×21
=4×3/6
=12/6
=2
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