Apollonius quadrilateral
In geometry, an Apollonius quadrilateral is a quadrilateral A B C D {\displaystyle ABCD} such that the two products of opposite side lengths are equal. That is, A B ¯ ⋅ C D ¯ = A D ¯ ⋅ B C ¯ .
In geometry, an Apollonius quadrilateral is a quadrilateral A B C D {\displaystyle ABCD} such that the two products of opposite side lengths are equal. That is, A B ¯ ⋅ C D ¯ = A D ¯ ⋅ B C ¯ .
In geometry, an Apollonius quadrilateral is a quadrilateral A B C D {\displaystyle ABCD} such that the two products of opposite side lengths are equal. That is, A B ¯ ⋅ C D ¯ = A D ¯ ⋅ B C ¯ .
Source: Wikipedia "Apollonius quadrilateral" · CC BY-SA 4.0
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