1.

The angle of a sector of a circle is `72^(@)` and radius of the circle is 10 m. The ratio of the circumference of the circle and the length of the arc of the sector is ________.A. `5:1`B. `1:5`C. `4:1`D. `1:4`

Answer» Correct Answer - A
`"Length of the arc"=(72^(@))/(360^(@))xx2pir=(2pir)/(5)`
`"Circumference of the circle"=2pir`
`"The required ratio"=2pir:(2pir)/(5)=5:1`


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