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Measure of an arc of a circle is 80° and its radius is 18 cm. Find the length of the arc. (π = 3.14)

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Given: Radius (r) = 18 cm, 

Measure of the arc (θ) = 80° 

To find: Length of the arc. 

Length of arc = θ/360 × 2πr 

= 8/360 × 2 × 3.14 × 18 

= 2/9 × 2 × 3.14 × 18 

= 2 × 2 × 3.14 × 2 = 25.12 cm 

∴ The length of the arc is 25.12 cm.

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