Chapter 4.1, Problem 2E

To determine

To fill : Fill in the blanks to complete the given statements.

Answer to Problem 2E

It is called one radian.

Explanation of Solution

Given information : Measure of a central angle that intercepts an arc equal in length to the radius of the circle.

We know that the measure of a central angle that intercepts an arc equal in length to the radius of the circle.

Now if radius of the circle is 2 cm and the arc length is also 2 cm then the central angle $\theta$ is

1 Radian.

i.e. $\theta =\frac{r}{s}=\frac{2}{2}=1$ Radian.