Angles

• An angle is defined as the amount of turn between two straight lines that share a common end point.
• Vertex: The common point where the two lines meet.
• Arms: The lines that make up the angle.
• Degrees: The size of the angle is measured in degrees and usually denoted with the symbol.
• Protractor: A tool that is used to measure angles.
• Types of Angles:

  1. Acute Angle
  2. Right Angle
  3. Obtuse Angle
  4. Straight Angle
  5. Reflex Angle
  6. Full Rotation Angle
  7. Zero Degree Angle
• Acute Angle: An angle that measures greater than 0° and less than 90°.
• Right Angle: An angle that measures 90°.
• Obtuse Angle: An angle that measures greater than 90° and less than 180°.
• Straight Angle: An angle that looks like a straight line and measures 180°. It is half a revolution of a circle.
• Reflex Angle: An angle that is more than 180° and less than 360°.
• Full Rotation Angle: An angle that is equal to 360°.
• Zero Degree Angle: An angle that does not form a vertex or measure 0°.