The Greedy Triangle (Brainy Day Books)

What an adorable book! This is a great way to teach geometry, and the colors are amazing. I as a teacher appreciate the obvious math connections, but on the deeper level you can make this a story of being true to yourself and recognizing your own greatness (truly, the triangle is indeed one of the strongest shapes despite having a mere three sides). The shapes come to life, especially the title Triangle, and the reader becomes both annoyed and supportive of him as he goes through his bizarre and clever journey through the world of geometry. Adorable story and gorgeous illustrations.