find the length of an arc of a circle of diameter 20cm which subtends an angle of 45 degree at the circle.
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the formula of length of an arc is ∆÷360 2πr
∆ is given 45 degree and radius = diameter ÷ 2 = 20÷2 = 10
45÷360 × 2×22÷7×10
is equal to 55÷7 = 7.85 cm
∆ is given 45 degree and radius = diameter ÷ 2 = 20÷2 = 10
45÷360 × 2×22÷7×10
is equal to 55÷7 = 7.85 cm
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