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More variations on the Steiner-Lehmus theme
Published online by Cambridge University Press: 14 February 2019
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The celebrated Steiner-Lehmus theorem states that if the internal bisectors of two angles of a triangle are equal, then the triangle is isosceles. In other words, if P is the incentre of triangle ABC, and if BP and CP meet the sides AC and AB at B′and C′, respectively, then
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