We included HMH Into Math Grade 4 Answer Key PDF Module 18 Review to make students experts in learning maths.

Vocabulary

Choose the correct term from the Vocabulary box to complete the sentence.

Vocabulary
line of symmetry
line symmetry
regular polygon

Question 1.
A figure is said to have ____________ if it can be folded about a line so that its two parts match exactly.
The line is called a ____________.
A figure is said to have Line symmetry if it can be folded about a line so that its two parts match exactly.
The line is called a Line of symmetry.

Question 2.
A ____________ is a closed plane shape with all sides equal in length and all angles equal in measure.
A Regular polygon is a closed plane shape with all sides equal in length and all angles equal in measure.

Concepts and Skills

Choose which line is a line of symmetry for the figure. Circle its letter.

Question 3.  Explanation:
Line of symmetry is defined as a line which divides the given figure into two equal halves so that if we fold the figure by the line of symmetry then both sides of the line should align or match each other. The line of symmetry denoted as ‘A’ satisfies the above rule.

Question 4.  Explanation:
Line of symmetry is defined as a line which divides the given figure into two equal halves so that if we fold the figure by the line of symmetry then both sides of the line should align or match each other. The line of symmetry denoted as ‘B’ satisfies the above rule.

Question 5.
Use Tools Select all the figures that appear to have at least one line of symmetry. Name the strategy or tool you will use to solve the problem, explain your choices, and then find the answers.  Explanation:
Option A and C have one line of symmetry. Line of symmetry is defined as a line which divides the given figure into two equal halves so that if we fold the figure by the line of symmetry then both sides of the line should align or match each other.

Question 6.
Select all the figures that have exactly 4 lines of symmetry.  Explanation:
Option A and B are having exactly four lines of symmetry. Option C, D, E, F have either less than 4 or greater than 4 lines of symmetry.

Question 7.
Misha’s pattern follows the rule 3 sides, 5 sides, 4 sides, repeat. Which is the next figure in her pattern?   