1.10. Vertical Angles http://www.ck12.org
MEDIA
Click image to the left for more content.CK-12 Foundation: Chapter1VerticalAnglesB
Vocabulary
Vertical anglesare two non-adjacent angles formed by intersecting lines. They are always congruent.
Guided Practice
Find the value ofxory.
Answers:
- Vertical angles are congruent, so set the angles equal to each other and solve forx.
x+ 16 = 4 x− 5
3 x= 21
x= 7 ◦- Vertical angles are congruent, so set the angles equal to each other and solve fory.
9 y+ 7 = 2 y+ 98
7 y= 91
y= 13 ◦- Vertical angles are congruent, so set the angles equal to each other and solve fory.
11 y− 36 = 63
11 y= 99
y= 9 ◦Practice
Use the diagram below for exercises 1-2. Note thatNK⊥
←→
IL.
- Name one pair of vertical angles.