**A triangle is a polygon with 3 sides and 3 angles?**

**The types of triangles are equilateral, isosceles, scalene, and right.**

In this

**experiment,**students will

**predict**the

**sum**of all 3 interior angles of a particular triangle. Then they will

**predict**if the different kinds of triangles have the same sum for their interior angles.

**Materials**- paper
- pencil
- marker (optional)
- ruler
- protractor
- scissors

__Directions__- Have students
**draw**3 different types of triangles and**cut**out each one.

**Mark**each angle. Use a square for right angles and a curved line for all other angles.

- Have the student
**choose**one of the triangles. **Predict**the**sum**of all 3 interior angles.**Cut**off the corners of the triangle

**Place**the cut pieces on a protractor next to each other. (The points of the angles should touch the center of the protractor.)

- What is the
**sum**of all 3 angles? - Next
**predict**if the answer will be the same for the other triangles. **Repeat**the steps above for the other triangles- Was the
**prediction**correct? What is the sum of the interior angles in a triangle?

*The sum of all the angles in a triangle = 180 degrees.*

*Have fun with angles!*

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