CK-12 Geometry-Concepts

http://www.ck12.org Chapter 1. Basics of Geometry

3.

Answers:

1. 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 ◦

2. 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 ◦

3. Vertical angles are congruent, so set the angles equal to each other and solve fory.

11 y− 36 = 63

11 y= 99

y= 9 ◦

Interactive Practice

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/113047

Explore More

Use the diagram below for exercises 1-2. Note thatNK⊥

←→

IL.