# Angles

Not to be confused with angels, angles are the pointed corners of shapes. Angles can be named three different ways.

This angle could be named any of these ways:

•  (counterclockwise)
•  (clockwise)
•  (just the vertex)

Look Out: when naming an angle using three letters, the vertex must always be the middle letter!

## Types of Angles

 Name Description Example Acute Angle An angle less that 90°. Lame joke: this angle is so small and a-cute! Obtuse Angle An angle greater than 90°, but less than 180°. Right Angle An angle that is exactly 90°. This is commonly denoted with a small box in the corner. Straight Angle A 180° angle. It's - you guessed it - a straight line. Supplementary Angles Angles that add up to 180°. are supplementary angles. Complementary Angles Angles that add up to 90°. are complementary. Vertical Angles When two lines intersect, opposite angles are called "vertical angles". Vertical angles are congruent.

Oh, btw, congruent angles are two or more angles that have the same measurement.