Question

Measure of an arc of a circle is 80 cm and its radius is 18 cm. Find the length of the arc. ( $\mathrm{\pi }$ = 3.14 )

Answer 1

Radius of the arc, r = 18 cm

Measure of the arc, θ = 80º

∴ Length of the arc = $\frac{\theta }{360°}\times 2\mathrm{\pi }r=\frac{80°}{360°}\times 2\times 3.14\times 18$ = 25.12 cm

Thus, the length of the arc is 25.12 cm.