Daisy didn't know this either, so I set out to show her.
Do you notice what happens? When the three corners are fit together, they form a straight line. Every time! (We tried out 3 different triangles to check this) Guess how many degrees are in a straight line? Yup. 180. Therefore, the three corners of a triangle add up to 180.
How is this useful? Well, if you know the measures of two of the angles, you can find the measure of the third. Ta Da!
It also comes in handy when finding the measures of angles in other shapes such as rectangles, parallelograms (I love to spell that word!) and when working with angles and parallel lines.
Did I mention that I got 100% on every test in high school geometry and finished the class with an A+?
Anyone have any proofs I can work out???????
5 comments:
Ooohhh... I love this! Proving or showing or discovering the rule is so much more meaningful than memorizing a rule. Thanks for contributing to the CM carnival.
I will bookmark this as well for future reference.
This is an awesome post. So simple and so obvious, but I sure never thought of it. I'm going to remember this one.
Thanks
Very nice demonstration!
Wonderful!
Good stuff for a visual learner.
Post a Comment