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Geometry - Angles

Complementary, supplementary, vertical, adjacent, congruent, triangles

TermDefinition
Supplementary Angles Two angles that have a sum of 180º (they add up to 180º)
Complementary Angles Two angles that have a sum of 90º (they add up to 90º)
Vertical Angles Two angles that are opposite and equal, formed when two lines intersect
Adjacent Angles Two angles that share a common vertex and a common ray (two angles that are right next to each other)
Congruent Angles Angles that are equal
Parallel Lines Two lines that never cross
Transversal A line that cuts between two parallel lines
The sum of the angles in a triangle is... 180º
Exterior Angles of a Triangle Angles outside the triangle that make a supplementary pair (180). It is also equal to the sum of the other two interior angles.
What do supplementary angles add up to? 180º
What do complementary angles add up to? 90º
How do you set up an equation to find a missing angle with supplementary angles? Add the two angles together and set it equal to 180º
How do you set up an equation to find a missing angle with complementary angles? Add the two angles together and set it equal to 90º
How do you set up an equation to find a missing angle with vertical angles? Set the two angles equal to each other
How can you tell if two angles are supplementary from a picture? They form a straight line
How can you tell if two angles are complementary rom a picture? They form a right angle (look for the box in the corner)
How can you tell if two angles are vertical from a picture? They are opposite each other
How do you set up an equation to find the missing angle of a triangle? Add all three angles together and set it equal to 180º
Created by: HStout
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