Question

Find the length of an arc of a circle of diameter 20 cm which subtends an angle
of 45° at the centre.​

Answer 1

Answer:

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Step-by-step explanation:

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