The radian measure of an angle θ is the length of the

a) opposite side

b) diameter

c) hypotenuse

d) arc

that subtends the angle in a circle of radius

pi

1

4

1/2

pi/2

In Trigonometey, the radian measure of an angle theta is the length of an arc that subtends in a circle of radius having a formula of circumeference divided by 2xpi and that the ratio 2pi and the circumference over the radius is called tha radian measure.