Straight angles are special types of angles for a few reasons:

1. What is a Straight Angle?
   A straight angle measures exactly 180 degrees.

2. How is it Formed?
   It happens when two rays point in opposite directions. This creates a straight line.

3. Different Types of Angles:
   A straight angle helps us understand other angles:

   • Acute Angles: These are less than 90 degrees.
   • Right Angles: Exactly 90 degrees.
   • Obtuse Angles: Between 90 and 180 degrees.
   • Reflex Angles: Between 180 and 360 degrees.
   • Full Angles: Exactly 360 degrees.

4. Important Features:

   • A straight angle divides a circle into two equal parts.
   • You’ll see straight angles in geometry and in everyday situations, like when we measure line segments.