# Tri - Angles

In class, we talked about the word *TRIANGLE*.
We talked about other words that had the same parts.
We talked about *TRICYCLE *and *BICYCLE*.
We guessed that *TRI* might mean *THREE.
*But we are still trying to figure out what *ANGLE* means.
On this page, you can see a TRIANGLE.
You can change the triangle by moving around the colored points.
**
Make as many different **triangles **as you can think of.
**Then, **do the math.
**Follow the directions on the screen.
Also use your paper worksheet.
Write down the values of the letters (A, B, and C).
Also write the sum (A + B + C).
Write these things **each time you make a new triangle.**

What patterns did you notice on your paper worksheet?
Why doesn't the sum of A + B + C ever change?
**Discuss with your classmates.**