We included **HMH Into Math Grade 4 Answer Key PDF** **Module 18 Lesson 2 Identify and Draw Lines of Symmetry **to make students experts in learning maths.

## HMH Into Math Grade 4 Module 18 Lesson 2 Answer Key Identify and Draw Lines of Symmetry

I Can identify two-dimensional figures that have line symmetry. I can draw all lines of symmetry on a two-dimensional figure.

**Step It Out**

Question 1.

A computer club is designing new signs to have printed and displayed outside. The two-dimensional figures used for the signs need to be symmetrical.

A. Trace, cut out, and fold the figures below in different ways to test for line symmetry. Identify the figures that appear to have line symmetry.

Answer:

B. Draw any lines of symmetry on the figures below.

Answer:

Explanation:

In the above image we can observe different shapes. The shape rhombus have both horizontal and vertical line of symmetry.

The equilateral triangle have 3 lines of symmetry because all sides are equal and all angles are equal.

The number of lines of symmetry in a regular polygon is equal to the number of sides, A pentagon have 5 sides. So, the pentagon have 5 lines of symmetry.

**Turn and Talk** If you moved one of your lines of symmetry over a little, would it still be a line of symmetry? How do you know?

Answer:

Question 2.

The polygons below are choices for the new signs.

A. Which of the polygons are regular polygons?

Answer:

B. Identify the number of sides for the polygon.

Answer:

C. Draw all the lines of symmetry and identify the number of lines of symmetry.

Number of sides ___________

Number of lines of symmetry ________

Answer:

Number of sides = **3 **

Number of lines of symmetry = **1**

Explanation:

A Isosceles triangle have 3 sides. In that two sides are equal in length and two angles are equal. So, Isosceles triangle have 1 line of symmetry.

Number of sides ___________

Number of lines of symmetry ________

Answer:

Number of sides = **4**

Number of lines of symmetry = **4**

Number of sides ___________

Number of lines of symmetry ________

Answer:

Number of sides = **4**

Number of lines of symmetry = **1**

Explanation:

A trapezoid have four sides. One pair of opposite sides are parallel. An isosceles trapezoid have 1 line of symmetry.

Number of sides ___________

Number of lines of symmetry ________

Answer:

Number of sides = **8**

Number of lines of symmetry = **8**

Number of sides ___________

Number of lines of symmetry ________

Answer:

Number of sides = **3**

Number of lines of symmetry = **3**

Connect to Vocabulary

A regular polygon has all sides equal in length and all angles equal in measure.

**Turn and Talk** What do you notice about the relationship between the number of sides in a regular polygon and the number of lines of symmetry?

Answer:

Question 3.

Nathan’s art studio is painting clay tiles to use in a walkway. Nathan starts a design that will have 2 lines of symmetry.

Complete the design.

Answer:

**Check Understanding**

Question 1.

Rocco draws a regular polygon with 12 sides. Next, he draws all the lines of symmetry. How many lines of symmetry does he draw? How do you know?

Answer:

**Draw all lines of symmetry for the figure.**

Question 2.

Answer:

Explanation:

In the above image we can observe one figure. The figure have both horizontal and vertical line of symmetry.

Question 3.

Answer:

The above figure has four lines of symmetry.

**On Your Own**

Question 4.

**STEM** Maya is writing a science report on the life cycle of the Florida honey bee. She illustrates her report with a drawing of some honeycomb from the honey bee’s hive.

Find and draw all the lines of symmetry for the enlarged section of the honeycomb.

Answer:

Explanation:

The number of lines of symmetry in a regular polygon is equal to the number of sides. The enlarged section of the honeycomb shape is hexagon. A hexagon have 6 sides. So, the hexagon have 6 lines of symmetry.

Question 5.

**Critique Reasoning** Marshall says that all triangles have 3 lines of symmetry because they have 3 sides. Is Marshall correct or incorrect? Explain.

Answer:

Question 6.

Bailey’s computer club is designing new emojis to use in the school newsletter. Circle the emojis that have line symmetry. Draw all the lines of symmetry.

Answer:

**Does the design have line symmetry? Write yes if it does or no if it does not. If your answer is yes, draw all lines of symmetry.**

Question 7.

Answer:

**No**, the above design doesn’t have line of symmetry.

Question 8.

Answer:

**Yes**, the above design have vertical line of symmetry.

Question 9.

Answer:

**Yes**, the above design have vertical line of symmetry.

Question 10.

**Open Ended** Flora, Juan, and Cooper each draw a quadrilateral. Flora draws a quadrilateral that has no lines of symmetry. Juan draws a quadrilateral that has exactly 2 lines of symmetry. Cooper draws a quadrilateral that has 4 lines of symmetry. Draw a quadrilateral that each student could have drawn. Show the lines of symmetry.

Answer:

Question 11.

**STEM** Insects and animals can have line symmetry. Do any of these have line symmetry? Write yes if it does or no if it does not. If your answer is yes, draw all lines of symmetry.

Answer:

**On Your Own**

Question 12.

Write your first name in capital letters. Which letters appear to have line symmetry? Draw all the lines of symmetry.

Answer:

Explanation:

My first name is DURGA. The letters D, U, A have line of symmetry. The letter D have horizontal line of symmetry and the letters U and A have vertical line of symmetry.

Question 13.

Complete the drawing to show a symmetrical design.

Answer:

**Complete the design so that the line is a line of symmetry.**

Question 14.

Answer:

Question 15.

Answer: