parallel lines and transversals. congruent angles angles that have the same measurement
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Parallel Lines and Transversals
Congruent Angles
• Angles that have the same measurement
Parallel Lines
• Two lines that always stay the same distance apart. (they never touch)
Perpendicular Lines
• Cross perfectly so that all four angles are 90 degrees
Transversal• Intersects two parallel lines to form many
sets of congruent angles. We have special names for these relationships
transversal
Vertical Angles
• All vertical angles are congruent • (they have the same measurement)
12
3 4
Angles 1 and 2 are vertical angles. So are angles 3 and 4
See if you can spot them
12
34
Angles 1 and 3, and angles 2 and 4
Corresponding angles
• When you draw parallel lines and a transversal, these angles have the same measure and position on each line
Corresponding angles
Alternate Interior Angles
Alternate Interior angles
Key Words: Alternate and Interior
Alternate Exterior Angles
Alternate Exterior angles
Key Words: Alternate and Exterior
Consecutive Interior Angles
Consecutive Interior angles
Key Words: Consecutive and Interior
Finding Missing Angles
• If you are given one angle measurement, you can find the rest of the measurements using the relationships.
40°
130°
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