Classifying Angles - Acute, Right, or Obtuse

Which of the following angles is an obtuse angle?

Which of the following is NOT a property of a right angle?

• It measures 90 degrees.

• It is less than an obtuse angle.

• It forms a perfect square corner.

• It is more than 90 degrees.

• Acute

• Right

• Obtuse

• Straight

Using a protractor, you measure an angle and find it to be 150 degrees. How would you classify this angle?

• Acute angle

• Right angle

• Obtuse angle

• Straight angle

Which angle type is pictured?

• Acute

• Right

• Obtuse

• Straight

When classifying a triangle by its angles, what type of triangle has one right angle? 

• acute triangle

• right triangle

• obtuse triangle

• none of the above

Classify this triangle.

• obtuse

• right

• acute

Classify this triangle

• right

• obtuse

• acute

Classify this triangle.

• obtuse

• right

• acute

Classify this triangle.

• acute

• right

• obtuse