Classify Angels and 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

Use the angles to classify the triangles

• acute

• obtuse

• right

What kind of triangle is this?

• Right

• Obtuse

• Acute

A triangle has no pairs of perpendicular sides, 2 acute angles and one obtuse angle.

Is the triangle an acute, obtuse, or right triangle?

The triangle is​ ​ ​ (a)  

• right because it has 1 right angle

• right because it has 2 acute angles

• obtuse because it has 2 acute and 1 obtuse angle

• acute because it has 3 acute angles

• acute

• obtuse

• right

• acute

• obtuse

• right

• acute

• obtuse

• right