Norton Cox
05/24/2024 · Middle School
Express the following angles into radians. \( \begin{array}{lllll}\text { (i) } 30^{\circ} & \text { (ii) }(60)^{\circ} & \text { (iii) } 135^{\circ} & \text { (iv) } 225^{\circ} & \text { (v) }-150^{\circ} \\ \text { (vi) }-225^{\circ} & \text { (vii) } 300^{\circ} & \text { (viii) } 315^{\circ} & & \end{array} \) Convert each of following to degrees.
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Step-by-step Solution
To convert degrees to radians, you use the conversion factor that \(1^\circ = \frac{\pi}{180}\) radians. Here's how you would convert each of the given angles to radians:
(i) \(30^\circ\)
\[ 30^\circ \times \frac{\pi}{180} = \frac{30\pi}{180} = \frac{\pi}{6} \text{ radians} \]
(ii) \(60^\circ\)
\[ 60^\circ \times \frac{\pi}{180} = \frac{60\pi}{180} = \frac{\pi}{3} \text{ radians} \]
(iii) \(135^\circ\)
\[ 135^\circ \times \frac{\pi}{180} = \frac{135\pi}{180} = \frac{3\pi}{4} \text{ radians} \]
(iv) \(225^\circ\)
\[ 225^\circ \times \frac{\pi}{180} = \frac{225\pi}{180} = \frac{5\pi}{4} \text{ radians} \]
(v) \(-150^\circ\)
\[ -150^\circ \times \frac{\pi}{180} = -\frac{150\pi}{180} = -\frac{5\pi}{6} \text{ radians} \]
(vi) \(-225^\circ\)
\[ -225^\circ \times \frac{\pi}{180} = -\frac{225\pi}{180} = -\frac{5\pi}{4} \text{ radians} \]
(vii) \(300^\circ\)
\[ 300^\circ \times \frac{\pi}{180} = \frac{300\pi}{180} = \frac{5\pi}{3} \text{ radians} \]
(viii) \(315^\circ\)
\[ 315^\circ \times \frac{\pi}{180} = \frac{315\pi}{180} = \frac{7\pi}{4} \text{ radians} \]
For converting radians to degrees, you use the conversion factor that \(1 \text{ radian} = \frac{180}{\pi}\) degrees. However, you did not ask for the conversion to degrees, so I have only provided the conversion to radians for each angle.
Quick Answer
(i) \(30^\circ = \frac{\pi}{6}\) radians
(ii) \(60^\circ = \frac{\pi}{3}\) radians
(iii) \(135^\circ = \frac{3\pi}{4}\) radians
(iv) \(225^\circ = \frac{5\pi}{4}\) radians
(v) \(-150^\circ = -\frac{5\pi}{6}\) radians
(vi) \(-225^\circ = -\frac{5\pi}{4}\) radians
(vii) \(300^\circ = \frac{5\pi}{3}\) radians
(viii) \(315^\circ = \frac{7\pi}{4}\) radians
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