A New Proof of the Lester’s Perimeter Theorem in Euclidean Space
An injection defined from Euclidean space n-space E^n to itself which preserves the triangles of perimeter 1 is an Eucldean motion. J. Lester gave two different proofs for this theorem in Euclidean plane  and Euclidean space . In this study a new technique is developed for the proof of this theorem which is valid in both Euclidean plane and Euclidean space.
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