#FunFact: The common external tangent segment connecting any 2 tangent circles has a length equal to the GEOMETRIC MEAN of the radii of both circles. 😯 How to prove? 🤔(Source: @gogeometry). https://t.co/3RwqD4ki5M @geogebra #MTBoS #ITeachMath #geometry #proof #EdTech #math pic.twitter.com/fFIsxGFvMO
— Tim Brzezinski (@TimBrzezinski) August 5, 2019