Curated Video
The Rectangle Area Puzzle - The Trick To Solve Without Formulas
This is a video I made a long time ago but forgot to publish! Consider this puzzle as a bite-size holiday bonus. A rectangle is divided into 4 rectangles, and you know the areas of 3 of them are 16, 13, and 39. What is the area of the...
Curated Video
HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given?
You may remember the song "12 Days of Christmas" in which each day you get N gifts, plus all the gifts from the preceding days. How many gifts are given in total? What's a general formula? Algebraic proof...