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1. |
Two circular metallic discs have a thickness of 15 mm. Their areas are in the ratio of 9:1. The smaller dia disc is pressed against the bigger disc and rotated around it on a flat surface. How many times will the small disc rotate before it completes one circle of the bigger disc? |
A. | 3 |
B. | 3π |
C. | π |
D. | None of these |
Answer» D. None of these | |