This handy Math in Focus Grade 2 Workbook Answer Key Chapter 18 Lines and Surfaces detailed solutions for the textbook questions.

## Math in Focus Grade 2 Chapter 18 Answer Key Lines and Surfaces

**Math Journal**

Draw a happy face using curves only.

Answer:

Explanation:

I used curves to draw a happy face.

Draw a sad face using parts of lines and curves.

Answer:

Explanation:

I used parts of lines and curves to draw a sad face.

**Put On Your Thinking Cap!**

**Challenging practice**

The shapes at the bottom of this page can be combined to make a square. Color the pieces yellow. Cut them out and paste them below to make the square.

Answer:

**Chapter Review/Test**

**Vocabulary**

**Fill in the blanks with words from the box.**

Question 1.

A ball has a __________ surface.

It can _________ on the ground.

Answer:

A ball has a curved surface.

It can roll on the ground.

Question 2.

A picture has a __________ surface.

You can ___________ pictures on top of each other.

Answer:

A picture has a flat surface.

You can stack pictures on top of each other.

**Concepts and Skills**

**Circle the correct answer.**

Question 3.

These are (parts of lines, curves).

Answer:

Explanation:

All the above shapes are parts of lines.

Question 4.

These are (parts of lines, curves).

Answer:

Explanation:

All the above shapes are curves.

**Draw**

Question 5.

A figure that has five parts of lines and three curves

Answer:

Explanation:

The figure has five parts of lines and three curves.

Question 6.

A figure that has only parts of lines

Answer:

Explanation:

The above figure has only parts of lines.

Question 7.

An object that has only curved surfaces

Answer:

Explanation:

The above object has only curved surfaces.

Question 8.

An object that has two flat surfaces and one curved surface

Answer:

Explanation:

The above object has 2 flat surfaces and 1 one curved surface.

**Problem Solving**

**Each pattern is made of curves and straight lines. Find the pattern. Then complete the pattern.**

Question 9.

Answer:

Explanation:

I drew the shape that complete the pattern

The pattern is made up of curves and straight lines.