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(528) 5

Part of 1997 Tournament Of Towns

Problems(1)

isosceles triangle wanted, parallelogram related

Source: TOT 528 1997 Spring J O5 - Tournament Of Towns

9/11/2024
EE is the midpoint of the side ADAD of a parallelogram ABCDABCD. FF is the foot of the perpendicular from the vertex BB to the line CECE. Prove that ABFABF is an isosceles triangle.
(MA Bolchkevich)
geometryparallelogram