We included **HMH Into Math Grade 4 Answer Key PDF** **Module 18 Lesson 1 Recognize Lines of Symmetry **to make students experts in learning maths.

## HMH Into Math Grade 4 Module 18 Lesson 1 Answer Key Recognize Lines of Symmetry

I Can identify a line of symmetry on a two-dimensional figure.

**Spark Your Learning**

Mehta’s class is studying the climate and wildlife of Argentina. They are following the activities posted in an online journal by a team of scientists working in Patagonia. Mehta’s class views photographs of snowflakes shared by the scientists.

Analyze this snowflake. Can you find a way to fold the snowflake along a line so that it has two parts that match exactly? How many different ways can you find? Draw the possible fold lines on the snowflake.

Answer:

**Turn and Talk** How could you use a mirror, instead of folding the snowflake, to see if two parts match exactly?

Answer:

**Build Understanding**

Question 1.

Mehta’s class is making a display about the seasons in the southern hemisphere. At the top of the display, they want to put the letters W, I, N, T, E, R. How can you tell if the letters have line symmetry?

Connect to Vocabulary

A line of symmetry is an imaginary line on a figure about which the figure can be folded so that its two parts match exactly. If a figure has a line of symmetry, it is said to have line symmetry.

A. Look at the letters. Are there any letters that you can fold so that each side of the folded letter is exactly the same? Circle those letters.

Answer:

Explanation:

The letters W, I, T, E can be folded. The each side of the folded letter is exactly the same. So, drawn a circle for those letters.

B. Are there any letters you can fold in more than one way and have the sides of the folded letter match exactly?

Answer:

The letter **I** Can be folded more than one way as horizontal and vertical and have the sides of the folded letter match exactly.

C. Draw a line to show where each of the possible folds are that divide the letters into matching halves.

Answer:

D. Which letters have line symmetry?

Answer:

The letters having line of symmetry are **W, I, T, E**.

E. Which letters have no lines of symmetry?

Answer:

The letters doesn’t have line of symmetry are **N, R**.

**Turn and Talk** How could you make sure that a figure you cut out of paper would have at least 2 lines of symmetry?

Answer:

Question 2.

Sonjia draws a picture of a lab that is designed for the cold weather in Argentina.

Look at Sonjia’s drawing below.

A. Does her drawing of the lab have line symmetry? Explain why or why not.

Answer:

B. Redraw the figure so it has line symmetry. Show a line of symmetry for the new figure.

Answer:

**Check Understanding**

Question 1.

Circle the letters that have a correctly-drawn line of symmetry.

Answer:

The letters A and C have a correctly drawn line of symmetry. So, draw a circle for A and C.

**On Your Own**

Question 2.

Attend to Precision The scientists in Argentina share illustrations from their work. Tell whether the drawings have zero lines, 1 line, or more than 1 line of symmetry. Draw all lines of symmetry.

Answer:

Explanation:

In the above image we can observe three drawings. The first drawing have more than 1 line of symmetry(both horizontal and vertical). The second drawing have zero lines of symmetry. The third drawing have one line of symmetry(Horizontal).

**Tell if the line appears to be a line of symmetry. Write yes or no.**

Question 3.

Answer:

**Yes,** The dotted line in the above figure appears to be a line of symmetry.

Question 4.

Answer:

**No**, The dotted line in the above figure doesn’t appears to be a line of symmetry.

Question 5.

Answer:

**Yes,** The dotted line in the above figure appears to be a line of symmetry.

Question 6.

Answer:

**No**, The dotted line in the above figure doesn’t appears to be a line of symmetry.

Question 7.

**Open Ended** The scientists are building a new observation deck at their research station. The deck has at least 6 sides. Draw a design that has 1 line of symmetry. Show the line of symmetry.

Answer:

**I’m in a Learning Mindset!**

What comment that a classmate made about line symmetry helped me understand it better?

Answer: