This handy Math in Focus Grade 4 Workbook Answer Key Chapter 10 Practice 3 Horizontal and Vertical Lines detailed solutions for the textbook questions.

## Math in Focus Grade 4 Chapter 10 Practice 3 Answer Key Horizontal and Vertical Lines

**Answer the questions.**

Question 1.

\(\overline{A B}\) is perpendicular to \(\overline{B C}\).

If \(\overline{A B}\) is a vertical line segment, what do you know about \(\overline{B C}\)?

Answer:

AB is a vertical line segment and BC is** horizontal line segment**.

Question 2.

a. \(\overline{D E}\) is a vertical line segment. Draw a horizontal line segment through point D and label it \(\overline{D F}\).

Answer:

Drawn a horizontal line segment through point D and label it as DF.

b. What do you know about the angle formed by \(\overline{D E}\) and \(\overline{D F}\)?

Answer:

The angle formed by DE and DF is** 90°**.

**Complete.**

Question 3.

a. \(\overline{M N}\) is a horizontal line segment. Draw a vertical line segment through point O to meet \(\overline{M N}\) and label the point P.

Answer:

b. What do you know about \(\overline{M N}\) and \(\overline{O P}\)?

Answer:

MN is a horizontal line segment and OP is a vertical line segment.

c. How many right angles are formed by \(\overline{M N}\) and \(\overline{O P}\)?

Answer:

**Two** right angles are formed by MN and OP.

Question 4.

a. \(\overline{P Q}\) is a horizontal line segment.

Draw a vertical line segment at point P.

Name it \(\overline{P R}\). Then draw a vertical line segment at point Q.

Name it \(\overline{Q S}\).

Answer:

Drawn a vertical line segment at point P and named it as PR.

Drawn a vertical line segment at point Q and named it as QS.

b. What do you know about \(\overline{P R}\) and \(\overline{Q S}\)? Check with a drawing triangle and a straightedge.

Answer:

Both PR and QS are parallel to each other.

**Complete.**

Question 5.

a. \(\overline{A B}\) is a horizontal line segment and \(\overline{C D}\) is a vertical line segment. At point D, draw a line segment parallel to \(\overline{A B}\). Name it \(\overline{D E}\).

Answer:

At point D, drawn a line segment parallel to AB and named it as DE.

b. What do you know about \(\overline{C D}\) and \(\overline{D E}\)?

Answer:

Both CD and DE are perpendicular to each other.

**Complete.**

Question 6.

ABCD is a whiteboard fixed to the wall.

Name the vertical and horizontal line segments on the whiteboard.

Vertical line segments: ____

Horizontal line segments: ____

Answer:

Vertical line segments: **BA and CD**

Horizontal line segments: **AD and BC**