Convert $90^{\circ}$ to radian measure.
A$\dfrac{\pi}{4}$
B$\dfrac{\pi}{3}$
C$\pi$
D$\dfrac{\pi}{2}$
Answer & Solution
Correct answer: D. $\dfrac{\pi}{2}$
Conversion: $\theta_{\text{rad}} = \dfrac{\pi}{180^{\circ}} \theta_{\text{deg}}$. So $90^{\circ} = \dfrac{\pi}{180} \cdot 90 = \dfrac{\pi}{2}$.
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