Chapter 4, Problem 4CUR

To determine

To complete: the blank in the given statement.

Answer to Problem 4CUR

Perpendicular

Explanation of Solution

Given information:

The given statement is “If two intersecting lines form congruent adjacent angles, then the

lines are $\underset{\_}{}$ ”..

When two lines are intersecting and form congruent adjacent angles, then the sum of adjacent angles must be 180 degrees , as shown below:

  

Here, you can see that the lines are perpendicular.

So, if two intersecting lines form congruent adjacent angles, then the lines are perpendicular.

Hence, the blank is filled with term perpendicular.