Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. Two puzzles are presented each week: the Riddler Express for those ...
Summary We prove the next generalization of the Steiner-Lehmus theorem: if two equal cevians intersect with each other on the angle bisector of the third triangle vertex, then the triangle is ...
Steve Kenilworth sighs as he flops down on the couch in the staff room at Rick Astley High School, his Grade 8 math classes finally done for the day. "I'm grateful to ...
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