Classifying Triangle by Angle

Classify this triangle.

• obtuse

• right

• acute

Classify this triangle

• right

• obtuse

• acute

An obtuse triangle has 1 obtuse angle.

• True

• False

Which angle type is pictured?

• Acute

• Right

• Obtuse

• Straight

Classify this triangle by its angles

• Acute

• Right

• Obtuse

What type of triangle is this?

• Acute

• Right

• Obtuse

A(n) _________ is a triangle where all angles are less than 90 degrees.

A(n) __________ is a triangle with an angle larger than 90 degrees.

A right triangle is...

• a triangle with a 90 degree angle

• a triangle with all angles less than 90 degrees

• a triangle with an angle bigger than 90 degrees

An obtuse triangle is...

• a triangle with a 90 degree angle

• a triangle with all angles less than 90 degrees

• a triangle with an angle larger than 90 degrees