What is the measure

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

What is the measure, in radians, of the central angle that subtends an arc whose length is equal to the radius of the circle? (a)

\dfrac{\pi}{2}

(b)

1

(c)

\dfrac{1}{2\pi}

(d)

\pi