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| 1. |
Circles are inscribed in the acute angle alpha so that every neighbouring circles touch each other. If the radius of the first circle is R then find the sum of the radii of the first n circles in terms of R and alpha. |
| Answer» SOLUTION :`(R(1-sin.(ALPHA)/(2)))/(2SIN.(alpha)/(2))[((1+sin.(alpha)/(2))/(1-sin.(alpha)/(2)))^n-1]` | |