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A New Proof of the Centre Circle Chain
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DeLongchamps(1) (1877), and Pesc(2)(1891) proved by elementary methods(3) the following chain of theorems:
Theorem. Given n lines in a plane, the centre-circles of sets of (n-I) of these will be concurrent, also the centres of these will lie on a circle-the centre-circle of the n lines. The centre-circle of thret lines is the circumcircle of the triangle formed by them.
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