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| 1. |
ABC is an isosceles triangle with AB=AC. The images of the vertices A,B,C by the lines BC,CA,AB are respectively A',B',C'. If A'B'C' is equilateral find angle A. |
| Answer» ABC is an isosceles triangle with AB=AC. The images of the vertices A,B,C by the lines BC,CA,AB are respectively A',B',C'. If A'B'C' is equilateral find angle A. | |