# Classifying Triangles

- Author:
- Katie, Tim Brzezinski, Amy Boylan, Cathy

## Classifying Triangles

**two**models of each (each partner should create one of every type). 1) Acute Equilateral 2) Acute Isosceles 3) Acute Scalene 4) Right Isosceles 5) Right Scalene 6) Obtuse Isosceles 7) Obtuse Scalene

## Acute Triangles

## Acute Triangles

As you drag point B, notice the angles of the triangle. Acute triangles have angles with measures that are... Select all that apply:

## Obtuse Triangles

## Obtuse Triangles

You just looked at this triangle, but we can learn about obtuse triangles from it. Angle B is the key. What do you need to remember about obtuse triangles?

## Right Triangles

## Right Triangles

Observe what stays the same no matter what changes you make. What did you notice? Why do you think it's important?

## Right Triangles

Drag the blue point on the triangle until you have two sides that have the same length. This triangle has a special name: isosceles right triangle. What would be the measures of the other two angles for all isosceles right triangles?

## Equilateral

## Equilateral Triangle

As you have probably already determined, an equiangular triangle is also an equilateral triangle. All equiangular triangles have all angles that measure ___________ degrees.

## Use the Image below for the next question:

x = PQ = PR = QR =