In a circle of radius 21cm,an arc subtends an angle of 60 at the centre. Find
the length of the arc and area of the sector formed by the arc.
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i) length of arc APB = θ/360 ×(2πr)
= 60°/360° × 2×22/7×21
=1/6×2×22/7×21
=22 cm
ii) area of sector OAPB = θ/360×πr^2
= 60°/360° ×22/7×21×21
=1/6×22/7×21×21
= 1/6×22×3×21
= 231 cm^2
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