Sums of Squares of the Side Lengths and Various Radii of a Triangle
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For a triangle , let
,
,
be the lengths of the sides opposite the vertices
,
,
;
be the incircle;
be the circumcircle; and
,
,
be the excircles opposite
,
,
.
Contributed by: Minh Trinh Xuan (August 2022)
Open content licensed under CC BY-NC-SA
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