Monge's Problem
Draw a Circle that cuts three given Circles Perpendicularly. The solutionis obtained by drawing the Radical Center 
of the given three Circles. If it lies outside thethree Circles, then the Circle with center and Radius formed by the tangent from to one of thegiven Circles intersects the given Circles perpendicularly. Otherwise, if liesinside one of the circles, the problem is unsolvable.
References
Dörrie, H. ``Monge's Problem.'' §31 in 100 Great Problems of Elementary Mathematics: Their History and Solutions. New York: Dover, pp. 151-154, 1965.
- Gauss-Kuzmin-Wirsing Constant
- Gauss-Laguerre Quadrature
- Gauss-Manin Connection
- Gauss Map
- Gauss Measure
- Gauss Multiplication Formula
- Gauss Plane
- Gauss-Salamin Formula
- Gauss's Backward Formula
- Gauss's Circle Problem
- Gauss's Class Number Conjecture
- Gauss's Class Number Problem
- Gauss's Constant
- Gauss's Criterion
- Gauss's Double Point Theorem
- Gauss's Equation (Radius Derivatives)
- Gauss's Formula
- Gauss's Formulas
- Gauss's Forward Formula
- Gauss's Harmonic Function Theorem
- Gauss's Hypergeometric Theorem
- Gauss's Inequality
- Gauss's Interpolation Formula
- Gauss's Lemma
- Gauss's Machin-Like Formula