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:
Look Out: when naming an angle using three letters, the vertex must always be the middle letter!
|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°.
|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.
Name two sets of complementary angles.
Name two sets of vertical angles.
Name four obtuse angles.
Name four right angles.