Circle O has radius r. If an arc of the circle has a length of r/2, what is the measure of the central angle subtended by the arc?

arc-of-the-circle

#1

Circle O has radius r. If an arc of the circle has a length of r/2, what is the measure of the central angle subtended by the arc?

1 radian

π radians

π/2 radians

1/2 radian

Answer:

image