A line that intersects two or more parallel lines.
Transversal
Two lines that never intersect.
Parallel Lines
What is the supplement of 83o?
97o

Given lines m and n are parallel, what is the relationship between ∠3 and ∠6?
Alternate Interior Angles

Given lines m and n are parallel, m∠2 = 125o, what is the measure of <7?
x = 1250
What is the name of an angle that is less than 900?
Acute Angle
What is the name of an angle that is between 900 and 1800?
Obtuse Angle
What is the complement of 32o?
58o

Given lines m and n are parallel, what is the relationship between ∠5 and ∠8?
Vertical Angles

Given lines m and n are parallel, m∠1 = 450, what is m∠4 = ?
450
Two angles that add up to 180 degrees.
Supplementary Angles
A pair of opposite, congruent angles formed by two intersecting lines.
Vertical Angles
What is the complement of 45o?
45o

Given lines m and n are parallel, what is the relationship between ∠1 and ∠8?
Alternate Exterior Angles

Given lines m and n are parallel, m∠5 = 750, what is m<6=?
m∠6 = 1050
Two angles that add up to 900
Congruent Angles
Two congruent angles on opposite sides of the transversal and outside the parallel lines.
Alternate Exterior Angles
What is the supplement of 39o?
141o

Given lines m and n are parallel, what is the relationship between ∠4 and ∠6?
Same Side Interior Angles

Given lines m and n are parallel, m∠3 = 1150 , what is m<7=?
m∠7 = 115o
Another name for an angle that is between 1800 and 3600
Two congruent angles located in the same position, but on a different parallel line (1 inside and 1 outside the parallel lines).
Corresponding Angles
What is the supplement to the two angles 720 and 230?
850

Given lines m and n are parallel, what is the relationship between ∠4 and ∠8?
Corresponding Angles

Given lines m and n are parallel, m∠2 = 1250, what is m<1 =?
m∠1 = 55o