Types of Angles and Their Properties

This video tutorial introduces the concepts of right, acute, and obtuse angles. Right angles are exactly 90 degrees and are marked by a small box at the vertex. Acute angles measure less than 90 degrees, while obtuse angles are greater than 90 degrees but less than 180 degrees. The video explains how to identify each type of angle and emphasizes the importance of recognizing the small box in right angles. The tutorial concludes with a summary of the differences between these angles.

What is a key feature that distinguishes a right angle from other angles?

• It measures exactly 100°.

• It looks like a T.

• It has a small box at the vertex.

• It is always larger than 90°.

Which of the following angles is considered acute?

• 45°

• 90°

• 95°

• 180°

An angle measuring 89° is classified as:

• Straight

• Right

• Acute

• Obtuse

What is the range of measurements for obtuse angles?

• 180° to 270°

• 90° to 180°

• 0° to 90°

• 270° to 360°

Which angle measurement would be considered obtuse?

• 180°

• 120°

• 90°

• 85°

If an angle is larger than 90° but smaller than 180°, it is called:

• Reflex

• Obtuse

• Acute

• Right