alleryThe angle 90° in radians is:
A$\pi$ (full half-circle)
B$2\pi$ (full circle)
C$\pi/2$ (quarter circle)
D$\pi/4$ (one eighth)
Answer & Solution
Correct answer: C. $\pi/2$ (quarter circle)
180° = π radians.
So 90° = π/2 radians.
Quarter of a full circle (2π).
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