What are acute, obtuse, right, and straight angles

The video tutorial explains how to classify angles into four types: straight, right, acute, and obtuse. It begins by defining an angle as formed by two rays with a common endpoint. A straight angle is 180 degrees, forming a line, while a right angle is exactly 90 degrees. Acute angles are less than 90 degrees, and obtuse angles are greater than 90 but less than 180 degrees. The tutorial emphasizes the importance of understanding these classifications for geometric analysis.

What is the measure of an angle formed by two opposite rays?

• 360 degrees

• 45 degrees

• 180 degrees

• 90 degrees

Which angle is represented by a small box rather than an arc?

• Straight angle

• Obtuse angle

• Right angle

• Acute angle

What is the range of an acute angle?

• 0 to 90 degrees

• 90 to 180 degrees

• 180 to 360 degrees

• Greater than 90 degrees

An angle that is greater than 90 degrees but less than 180 degrees is called what?

• Straight angle

• Obtuse angle

• Right angle

• Acute angle

Which of the following is NOT a characteristic of an obtuse angle?

• Equal to 90 degrees

• Less than 180 degrees

• Forms a straight line

• Greater than 90 degrees