Question

The circumference of circle C is 90 cm. What is the length of AB (in red)?
Help please

Answer 1

30 cm

Explanation:

The length of the arc AB is calculated as

circumference × fraction of circle subtended by AB, that is

AB = 90 ×
`(120)/(360)`

= 90 ×
`(1)/(3)` = 30 cm

Answer 2

30cm

Explanation:

a circle is 360 degrees

120/360 = 1/3 the circumference

90 cm * 1/3 = 90 / 3 = 30