## Classify Triangles

## Work Time

# Classify Triangles

Use the Triangles Sketch interactive to explore equilateral, isosceles, scalene, acute, obtuse, and right triangles.

- For each triangle that is classified by sides, state everything you notice about the angles.
- For each triangle that is classified by angles, state everything you notice about the sides.
- Use the Exterior Angles button. What do you notice about the relationship of the exterior angles to the interior angles for each type of triangle?

INTERACTIVE: Triangles Sketch

## Hint:

- How are the angles in each figure related? What do the angles tell you about the figure?
- For each triangle classified by sides, what do you notice about the angles?
- Do any of the triangles that are classified by angles also have one of the characteristics of triangles that are classified by sides?
- What is the sum of the interior angles for each triangle?
- How does the sum of two of the angles compare to the measure of the third angle?
- If one of the angles is a right angle, what is the sum of the other two angles?