



 
Hi Cory, In my diagram (which is not to scale) the arc APB measures 150 feet and the radius of the circle is r feet.
Triangle CQB is a right triangle and hence by Pythagoras theorem
Solve for r. The angle BCA subtends an arc of length 150 feet in a circle of radius r. What is the measure of the angle BCA? I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 