# Triple Quad Formula

Level pending

Here is the Triple Quad Formula: $$(Q_1+Q_2+Q_3)^2=2(Q_1^2+Q_2^2+Q_3^2)$$ where $$Q_n$$ is a quadrance.

You have three points with three associated quadrances (i.e. square of the distance). Two of the quadrances are 1. The points are distinct.

What is the third quadrance?

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