Classify Triangles Acute Right Obtuse

Use the angles to classify the triangles

all angles less than 90° - acute triangle

1 angle is equal to 90° - right triangle

1 angle is greater than 90° - obtuse triangle

Use the angles to classify the triangles

Use the angles to classify the triangles

Use the angles to classify the triangles

Which triangle has all three of its angles measuring less than 90°?

• Acute

• Right

• Obtuse

• Equilateral

Classify this triangle.

• obtuse

• right

• acute

Based on its angles, what type of triangle is this?

Classify this triangle for its angles only.

• acute

• right

• isosceles

• scalene

How do you know this is an obtuse triangle?

Use the angles to classify the triangles

all angles less than 90° - acute triangle

1 angle is equal to 90° - right triangle

1 angle is greater than 90° - obtuse triangle