in a circle of radius 21 cm and arc subtends an angle of 60 degree at the centre find question number 1 the length of the arc second one area of sector formed by the Arc
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1. length of arc = 60/360×2πr
= 60/360×2×22/7×21
= 1/6×2×22×3
=22cm
2. area of sector= 60/360×πr×r
= 60/360×22/7×21×21
= 1/6×22/7×441
= 1/6×22×63
= 1/2×22×21
= 11×21 =231 cm
= 60/360×2×22/7×21
= 1/6×2×22×3
=22cm
2. area of sector= 60/360×πr×r
= 60/360×22/7×21×21
= 1/6×22/7×441
= 1/6×22×63
= 1/2×22×21
= 11×21 =231 cm
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