haha i guess my class are not real mathematicians yet
thanks jhevon for the degrees conversion
A central angle is . Now because then 88.8 cannot be a radian measure. It must be in degrees, .
So if the radius is 10 the an arc of is about 15.5 units in length.
You must not confuse radians with degrees. All real mathematics uses radians; almost all calculators use radian measure as the default setting.