It is known that P is a point outside the parallelogram ABCD, the diagonal AC and BD intersect at O, and AP ⊥ CP

It is known that P is a point outside the parallelogram ABCD, the diagonal AC and BD intersect at O, and AP ⊥ CP

Link Po
In △ APC
∵∠APC=90°
∴PO=1/2AC
Similarly, in △ BPD
∵PO=1/2BD
∴AC=BD
A quadrilateral ABCD is a parallelogram
And the diagonals are equal
The quadrilateral ABCD is a rectangle
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