Lines of Symmetry for 4th Grade
To test for a line of symmetry, imagine folding the shape along the line and check whether the halves land on each other exactly. A regular polygon has as many lines as it has sides. The examples below work through several shapes, with practice problems.
DETAILED EXPLANATION
A line of symmetry divides a shape so that one half is the mirror image of the other. A square has 4 lines of symmetry; a rectangle has 2.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
How many lines of symmetry does a square have?
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: A square has 4 lines of symmetry.
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