Right Angles Study Guide

Definition

A right angle is an angle that measures exactly 90 degrees. In geometric terms, it is formed when two lines intersect and the angles opposite each other are equal and measure 90 degrees.

Symbol

The symbol for a right angle is a small square placed in the corner of the angle.

Properties

• A right angle is always exactly 90 degrees.
• A right angle is one-quarter of a full 360-degree circle.
• When two lines form a right angle, they are perpendicular to each other.

Examples

Here are some examples of right angles in everyday objects:

• The corner of a book
• The shape of a square or rectangle
• The hands of a clock at 3:00

Practice Problems

Now, let's practice identifying right angles:

1. Identify the right angles in the following shapes:
   • square.png" alt="Square with right angles">
   • triangle.png" alt="Triangle without right angles">
2. Measure the angles in the clock showing 6:00. Are any of the angles right angles?

Conclusion

Understanding right angles is essential in geometry and in everyday life. Being able to identify and work with right angles will help in various math and real-world applications.