An elementary treatise on modern pure geometry (1893)
Lachlan, Robert · London, New York, Macmillan and Co. · leaf 272
al tothe differences of the angles at which they intersect. Hence, we have the theorem : The drcumdrcle of any circulartriangle is the Hart circle of the triangle formed by the circumcirclesof the inverse associated triangles*. 402. Several properties of the Hart circle of a triangle may bederived… … Thus let us consider three circles BCQR, CARP, ABPQ, inter-secting in the three pairs of points A, P; B, Q; G, R; each pairbeing inverse points with respect to the circle which cuts the threecircles orthogonally. It follows that the circle PQR is the Hartcircle of the triangle ABC formed by the…
Geometry
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