1. Transversal: Parallel Lines and Transversals
Corresponding Angles:
Alternate Interior Angles
Alternate Exterior Angles:
Corresponding Angles: Corresponding Angles:
Alt. Int. Angles: Alt. Int. Angles:
Alt. Ext. Angles: Alt. Ext. Angles:
A line that intersects two or more lines at different points
When a transversal cuts through parallel lines, certain angles formed are congruent.
Two angles that occupy the
same position. (like “upper left corner”) 3 1 6 8 7 5 4 2 h t d
Two angles that lie between the two lines on opposite sides of the transversal.
Two angles that lie outside the two lines on opposite sides of the transversal. 1 4 2 3 5 6 7 8 t n k

2. 1. Transversal t intersects parallel lines m and n.
If , find the measures of the other
numbered angles. Explain your reasoning.
2. Find the value of x that makes lines m and n parallel.
118°
(9x+10)°
3. In the figure, Name all angles congruent to 1 4 6 5 8 3 2 7 m n t m n t r t s 3 1 6 8 7 5 4 2