Question

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

Answer 1

Answer:

30cm

Step-by-step explanation:

a circle is 360 degrees

120/360 = 1/3 the circumference

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

Answer 2

Answer:

30 cm

Step-by-step explanation:

The length of the arc AB is calculated as

circumference × fraction of circle subtended by AB, that is

AB = 90 × $\frac{120}{360}$

     = 90 × $\frac{1}{3}$ = 30 cm