I’ve been sharing some of Catriona Shearer’s geometry puzzles with my younger son lately. The idea is for him to try to solve the problem and then explain a solution from the twitter thread about the problem.

The puzzle we looked at today was posted by Shearer on April 10th:

Watching him work through the solution is a great example of what a kid learning math looks like. His approach is very computational – sometimes the calculations can sort of overwhelm the geometry ideas for kids and that’s sort of what happens here:

The solution from the twitter thread that he liked was from Brenda Meshejian

He does a nice job of explaining this solution: