# How would i find the length of arc AC when AB is 120 degrees and AC is 90 degrees and the radius is 10?

##### 1 Answer

Aug 4, 2015

I found:

#### Explanation:

I am not sure to have interpreted your question right (I do not know why you need AB is 120°..) but anyway:

the length

where:

Using these data in the above expression (the angle has to be in radians) you get: