Discussion
By converting angle from degrees to radians, 40° is equal to
Answer: B
\[ \pi \text{ radians} = 180^{\circ} \]
\[ 40^{\circ} = 40 \times \frac{\pi}{180} = \frac{2\pi}{9} \]
\[ = 0.698 \text{ rad} \]
A radian is about \( 57.3^{\circ} \), so \( 40^{\circ} \) must come to a little under 1 radian - a quick check on the size of the answer.
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