A) \[\frac{\pi r}{2}\]
B) \[\pi r\]
C) \[2\pi r\]
D) \[\frac{\pi r}{2}+2r\]
Correct Answer: A
Solution :
| [a] Length of the arc of a quadrant of a circle |
| \[=\frac{1}{4}\times \] Circumference of a circle |
| \[=\frac{1}{4}\times 2\pi r=\frac{\pi r}{2}\] |
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