Study Guide: Acute Angles

Definition:

An acute angle is an angle that measures greater than 0 degrees and less than 90 degrees.

Examples:

• An angle of 30 degrees is an acute angle.
• An angle of 60 degrees is an acute angle.
• An angle of 89 degrees is also an acute angle.

How to Identify:

To identify an acute angle, simply measure the angle using a protractor. If the angle measures between 0 and 90 degrees, it is an acute angle.

Real-Life Examples:

Acute angles can be found in various real-life situations, such as the hands of a clock at 3 o'clock, the corner of a book, or the roof of a house.

Properties:

• Acute angles are always less than 90 degrees.
• The sum of two acute angles is always less than 180 degrees.

Practice Problems:

1. Identify whether the following angles are acute or not:
   • 45 degrees
   • 120 degrees
   • 80 degrees
2. Find the measures of two acute angles that add up to 100 degrees.

[Acute Angle] Related Worksheets and Study Guides:

• AnglesMathematics • Fifth Grade