Central angle of circle

Find the central angle of a circle with a radius of 3.2 cm, which subtends an arc 17 cm long.

Thanks for any help!

This question completely hinges on knowing the formula where S is the arc length, r is the radius of the circle, and is the measure of the central angle of the circle in radians (NOT DEGREES)

So, we have S and r, and we need to find

so if you want in degrees, multiply 5.3125 by