In geometry, Apollonius's theorem is a theorem relating the length of a median of a triangle to the lengths of its sides. It states that the sum of the squares of any two sides of any triangle equals twice the square on half the third side plus twice the square on the median bisecting the third side.
In geometry, Apollonius's theorem is a theorem relating the length of a median of a triangle to the lengths of its sides. It states that the sum of the squares of any two sides of any triangle equals twice the square on half the third side plus twice the square on the median bisecting the third side.
Source: Wikipedia "Apollonius's theorem" · CC BY-SA 4.0
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