Question

Determine the arc length measurement

Answer 1

≈ 4.2 cm

Explanation:

The arc length is calculated as

arc = circumference of circle × fraction of circle

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

= 2π × 2 ×
`(1)/(3)`

= 4π ÷ 3

≈ 4.2 cm ( to 1 dec. place )

Answer 2

Arc length is equal to its corresponding central angle.

That means that the arc measures 120° too.