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| 1. |
ABCD is a parallelogram. A circle through A and B is drawn, so that it interests AD at P and BC at Q. Prove that P, Q, C and D are concyclic. |
| Answer» ABCD is a parallelogram. A circle through A and B is drawn, so that it interests AD at P and BC at Q. Prove that P, Q, C and D are concyclic. | |