Obtuse, Right, and Acute Triangles

Use the angles to classify the triangles

Use the angles to classify the triangles

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

Find the measure of the missing angle in the triangle.

Find b.

Find the measure of the missing angle in the triangle.

Find the measure of the missing angle in the triangle.

Find the measure of the missing angle in the triangle.

This is a right triangle because —

• it is facing the right way

• it has 3 acute angles

• it has one 90 degree angle

• it does not have one obtuse angle

Which words best describe this triangle?

• Right

• Acute

• Obtuse

• Isosceles

• Scalene