Find the value of x.

• 15
• 16
• 18
• 19

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

What are complementary angles?

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

What are supplementary angles?

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

What are vertical angles?

• Angles that add up to 180°
• Angles that add up to 90°
• Angles that add up to 360°
• Angles that are opposite of each other when lines intersect and are equal

Solve for x

• 20
• 25
• 120
• 180

Solve for x

• 6
• 140
• 20
• 90

What do the interior angles in a triangle have a sum of?

• 180
• 90
• 360
• 270

• x = 54
• x = 9
• x = 24
• x = 144

Solve for x.

• 16
• 11
• 50
• 6