Question

WHAT IA APPOLINIOUS THEOREM .PROVE IT.

Answer 1

In geometry, Apollonius's theorem is a theorem relating the length of amedian of a triangle to the lengths of its side. It states that "the sum of the squares of any two sides of any triangle equals twice the square on half the third side, together with twice the square on the median bisectingthe third side".
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Answer 2

The answer of the question is here