The measurement of a central angle is [tex]\(\theta=240^{\circ}\)[/tex]. Find the measurement of [tex]\(\theta\)[/tex] in radians.

A. [tex]\(\theta=\frac{2}{3} \pi\)[/tex] radians
B. [tex]\(\theta=\frac{6}{5} \pi\)[/tex] radians
C. [tex]\(\theta=\frac{4}{3} \pi\)[/tex] radians
D. [tex]\(\theta=\frac{8}{3} \pi\)[/tex] radians



Answer :

To convert an angle from degrees to radians, we can use the formula:
[tex]\[ \text{radians} = \text{degrees} \times \left(\frac{\pi}{180}\right) \][/tex]

Given the angle [tex]\(\theta = 240^\circ\)[/tex], we can find its measurement in radians by performing the following calculation:

1. Substitute [tex]\(\theta = 240^\circ\)[/tex] into the formula:

[tex]\[ \theta_\text{radians} = 240^\circ \times \left(\frac{\pi}{180}\right) \][/tex]

2. Simplify the fraction:

[tex]\[ \theta_\text{radians} = 240 \times \left(\frac{\pi}{180}\right) = \frac{240\pi}{180} \][/tex]

3. Reduce the fraction by dividing both the numerator and the denominator by their greatest common divisor, which is 60:

[tex]\[ \frac{240\pi}{180} = \frac{240 \div 60 \pi}{180 \div 60} = \frac{4\pi}{3} \][/tex]

Hence, the measurement of [tex]\(\theta\)[/tex] in radians is:

[tex]\[ \theta_\text{radians} = \frac{4}{3} \pi \][/tex]

So, the correct answer is:

C. [tex]\(\theta = \frac{4}{3} \pi\)[/tex] radians

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