Books Books
The six straight lines. joining two and two the centres of the four circles which touch the sides of a triangle pass each through one of the vertices of the triangle.
Proceedings of the Edinburgh Mathematical Society - Page 49
by Edinburgh Mathematical Society - 1894

## The Elements of Euclid, books i. to vi., with deductions, appendices and ...

Euclides - 1884 - 434 pages
...points, /, /j, /2, /3, which are the centres of the four circles touching the three given straight lines. Or, the six straight lines joining two and two the centres of the four circles which touch AB, BC, CA, pass each through a vertex of the A ABC. The circles whose centres are Iv 7,, /3 are called...

## Weekly problem papers, with notes. [With] Solutions

John James Milne - 1885 - 388 pages
...4(Д2 + /P) sin A sin B sin С, R being the radius of the circum-circle. 7. A conic passes through the centres of the four circles which touch the sides of a triangle. Prove that the locus of its centre is the circumscribing circle. PAPER XIX. 2. Solve the equations...