In a
square ABCD, E is the midpoint of AB and F midpoint of BC. AF cuts DE at
G. Prove that the triangle FGD is a 3-4-5 triangle.

Did you know? Hidden inside every square is a 3-4-5 (right) triangle! 😯 How can we formally prove THIS true? 🤔(Source: @gogeometry). https://t.co/77ExcEzFyx @geogebra #MTBoS #ITeachMath #geometry #proof #EdTech #math #maths #MathEd #MathEdTech #FigureThat #GeomChat pic.twitter.com/G5YG9eNaTn

— Tim Brzezinski (@Brzezinski_Math) August 2, 2019

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