The vertical feet are e and f;

Because ab = CD

So OE=OF

According to the right triangle h 1

Because OE = of

There is also a male * * * edge op.

So the triangle OPE and OPF are congruent.

∠BPO=∠OPD

2. Because triangle OPE and OPF are congruent.

So PE=PF

Because AE=CF

So PE-AE=PF-CF

That is, PA=PC

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