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1 triangle + 2 parallel lines + 4 circumcenters = 😮? How to prove? Source: @gogeometry. https://t.co/xC4Sd6TCky @geogebra #MTBoS #ITeachMath #math #maths #EdTech #geometry #proof #MathEdTech #FigureThat #ProofWithoutWords #HSMath #CollegeMath