Lines of Symmetry

Find a line of symmetry in a butterfly, a stop sign, a flower.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 72

If you can fold a picture so both halves match exactly, the fold line is a line of symmetry. Let's fold this butterfly!
Both wings landed on each other. That dashed line is a line of symmetry!
Now fold this slanted shape down the middle. Watch where it lands!
The halves don't match, so that's not a line of symmetry. In fact, no fold at all makes this shape's halves match!
Some shapes have more than one. A rectangle has 2 lines of symmetry: up and down, and across. A square even has corner to corner lines!

Georgia's K-12 Mathematics Standards:

2.GSR.7.2 — Identify at least one line of symmetry in everyday objects to describe each object as a whole.