Question

which of the following formulas is used to calculate the length of an arc in radians?
a. l = 1/2 θr²
b. l = θr
c. l = 2πθ
d. l = θr²

Explanation:

Step1: Recall the arc - length formula

The formula for the length of an arc \(L\) of a circle with radius \(r\) and central angle \(\theta\) (in radians) is \(L = r\theta\).

Answer:

B. \(L=\theta r\)