As I wrote this entry, I realized I had no idea why a 90 degree angle is called a right angle, so I googled it. According to Dr. Michel Smith, professor and chair of the Mathematics Department in Auburn University's College of Sciences and Mathematics, "The word "right" is used for this angle because the word has the meaning of "true" or "correct." When a carpenter is building a house and he positions a wall, he wants that wall to be correctly placed; to be "right" or "true." So when the wall is vertical then it is correctly placed or "true." A correctly placed "true" wall is perfectly vertical and so it makes a "right" angle with the ground. This is what a right angle or a 90 degree angle is."

I learned something new today! I think I will follow the advice in my prior post – teachers should

**be less helpful**– by asking my students to find the origin of the term

*right angle*for themselves.

How funny! I love the way children deduce.

ReplyDeleteI was raised Roman Catholic - a friend moved into town right as the church changed the name of Sunday School from CCD to CCE. She asked her mom - the next time we move will it be CCF?

Why don't we take more advantage of this amazing ability these munchkins have?