# Classifying Triangles by Angles

- Author:
- Cathy

## Acute Triangles

## Acute Triangles

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

## 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. A right triangle, then must have...

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?

## Equiangular Triangle

## Equiangular Triangle

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