Multiplication Table Slide Rule
Using Publisher, I’ve created a slide rule for multiplication tables (up to 10×10). To use it: — Print it out and cut along the dotted line. &#...
Month: February 2017
An Algebraic Proof of the Pythagorean Theorem
Discussing the properties of similar triangles today, I derived a simple proof of the Pythagorean Theorem that uses ratios. (I do not claim this is original to ...
Bullies Playing the Victim
A recent cartoon by Conservative Glen McCoy shows newly-confirmed Secretary of Education Betsy DeVos being escorted by four faceless men in suits past a wall sp...
Isosceles Trapezoids and Right Angles
In this entry, I’m going to start with a concrete problem and develop an abstract generalization. The starting problem: Given isosceles trapezoid \(ABCD\)...
Growing Beyond the White Savior
A viral video recently circulated showing a black male teacher greeting each student in his elementary school class with a different handshake. It was praised a...
A Picture’s Thousand Words: Whitewashing Our Culture
It’s said that a picture is worth a thousand words. I recently saw a photograph whose context spoke volumes. A little over a week ago, Donald Trump issued an Ex...
Defending Truth: Winning the War on Fact
When Chuck Todd of “Meet the Press” accused Sean Spicer of spreading “falsehoods,” Presidential spokesperson KellyAnne Conway called them “alternati...