Traditional Culture Encyclopedia - Photography major - What is the Projection Theorem, represented by a diagram?

What is the Projection Theorem, represented by a diagram?

In the formula Rt△ABC, ∠BAC=90°, AD is the height on the hypotenuse BC, then the projection theorem is as follows:

AD^2?=?BD·DC

AB^2?=?BD·BC

AC^2?=?CD·BC

AB·AC?=?BC·AD

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