alleryAn angle of $90^\circ$ in radians is:
A$\pi$, the full half-turn around the clock face here
B$\pi/2$, the quarter turn on the clock dial face
C$2\pi$, the full revolution of the clock hand once
D$\pi/4$, half of the quarter turn on the clock
Answer & Solution
Correct answer: B. $\pi/2$, the quarter turn on the clock dial face
$90^\circ = 90\cdot \pi/180 = \pi/2$ rad.
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