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Geometry - Angles
Complementary, supplementary, vertical, adjacent, congruent, triangles
Term | Definition |
---|---|
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 |