Question

Find the length of the arc.

13 pie/6 in
20 pie/3 in
100 pie/3 in
825 pie/4 in

Answer 1

2nd option

Explanation:

the length of the arc is calculated as

arc = circumference × fraction of circle

= 2πr ×
`(120)/(360)` ( r is the radius )

= 2π × 10 ×
`(1)/(3)`

= 20π ×
`(1)/(3)`

=
`(20\pi )/(3)` in