A circle has a circumference of \blue{10}10. It has an arc of length \dfrac{9}{2} 2 9 ​ . What is the central angle of the arc, in degrees?

Answer 1

The arc is 4.5, i.e. the arc represents (4.5/10) = 45% of the circle, i.e. the angle is .45*360 = 162 degrees.