MCQOPTIONS
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MCQOPTIONS
| 1. |
Three circles of radii a, b, c (a < b < c) touch each other externally. If they have x-axis as a common tangent, then: |
| A. | \(\frac{1}{{\sqrt a }} = \frac{1}{{\sqrt b }} + \frac{1}{{\sqrt c }}\) |
| B. | \(\frac{1}{{\sqrt b }} = \frac{1}{{\sqrt a }} + \frac{1}{{\sqrt c }}\) |
| C. | a, b, c are in A.P. |
| D. | \(\sqrt a ,{\rm{\;}}\sqrt b ,{\rm{\;}}\sqrt c\) are in A.P. |
| Answer» B. \(\frac{1}{{\sqrt b }} = \frac{1}{{\sqrt a }} + \frac{1}{{\sqrt c }}\) | |