Angle Properties

• These are two angels that add together and equal 180 degrees

• This feature is nearly always associated with a straight line.

• A straight line has an angle measurement of 180 degrees

• 180 = 80 + X

• 180 - 80 = 80 - 80 + X

• 100 = X

• Two angles that add together and equal 90 degrees

• This feature will always be a right angle

• 90 = 40 + X

• 90 - 40 = 40 - 40 + X

• 50 = X

• The angles opposite of each other that are form by intersecting lines

• Vertical angles are always congruent (have the same measurement)

• Vertical angles are congurent

• Angle A and Angle C are congruent since they are vertical angles

• Angle C is equal to 45 degrees

with variables

• The sum of all the angles in a triangle is 180 degrees

• An exterior angle of a triangle is equal to the sum of its two interior opposite angles