Perpendicular + Special Angles

What are vertical angles?

• Angles that are adjacent to each other
• Angles that add up to 180°
• Angles that are opposite of each other when lines intersect
• Angles that add up to 90°

Tell whether the angles are complementary or supplementary. Then find the value of x.

• Complementary; x=25

• Complementary; x=5

• Supplementary; x=25

• Supplementary; x=5

Supplementary angles always add up to

Which angle is a vertical angle to with $\angle7$  ?

•  $\angle1$  

•  $\angle5$  

•  $\angle3$  

•  $\angle6$  

•  $\angle9$  

Solve for x

• 20

• 25

• 120

• 180

Write the equation of a line PERPENDICULAR to y = -2x + 1 that passes through the point (2, 3).

• $y=-\frac{1}{2}x+\frac{1}{2}$

• $y=\frac{1}{2}x+2$

• $y=-2x+7$

• $y=-2x+8$

Vertical angles are always

• acute
• total 180 degrees
• congruent (equal measures)
• adjacent angles

Complementary angles are angles that together equal

• 180 degrees

• 90 degrees

• 45 degrees

• 100 degrees

Find the value of x.

• 15
• 30
• 45
• 60

Slopes of perpendicular lines are...

• opposite (sign) reciprocals.

• opposites.

• identical.

• always 7.