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Lines of Symmetry
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What you will learn from this videoWhat you will learn
- We'll learn that a line of symmetry cuts a shape into 2 matching halves.
- We'll also learn how to identify lines of symmetry.
- And we'll see that we can find symmetry in animals, plants, and items we use everyday!
- Discussion Questions
Before Video
How do you describe a rectangle?ANSWERA rectangle is a 4-sided shape that has two sets of parallel lines that connect at right angles.
A square is a type of rectangle with 4 sides of equal length.
A parallelogram is a 4-sided shape that has two sets of parallel lines.
No. All squares are rectangles, but not all rectangles are squares!
No. All rectangles are parallelograms, but not all parallelograms are rectangles!
After Video
Does every object have a line of symmetry?ANSWERNo. Some objects have no lines of symmetry, some have 1 line, and some have more.
Answers may vary.
Answers may vary.
If letters are written very simply, then these have 1 line of symmetry: A, B, C, D, E, M.
These have 2 lines of symmetry: I, O, H, X.
These have none: F, G, J, L, N.
No. A circle has an infinite number of lines of symmetry, but the line must go through the center of the circle. So the circle must be folded in half.
- Vocabulary
- Mirror Image DEFINE
A flipped version of an image, like you would see on the other side of a mirror.
- Symmetry DEFINE
A shape has symmetry if it can be divided by a line so that each half is a mirror image of the other.
- Line of Symmetry DEFINE
The line that divides a shape into two mirror images.
- Rectangle DEFINE
A 4-sided shape that has two sets of parallel lines that connect at right angles.
- Square DEFINE
A type of rectangle with 4 sides of equal length.
- Parallelogram DEFINE
A 4-sided shape that has two sets of parallel lines.
- Diagonally DEFINE
Connecting two opposite corners.
- Infinite DEFINE
Going on forever; more than we could ever count.
- Mirror Image DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
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