Texas Math Models

Try “number line” or “4.5D”

Lines of symmetry

fold it and check

G4

Fold it. Does one half land exactly on top of the other?square4 fold linesrectangle2 fold linestriangle1 fold lineparallelogramnone at alla fold line may be slanted, not only up and acrossnot every triangle has onea parallelogram never doesturning a shape onto itself is not folding it; only a fold counts here

How this one works

How

imagine folding it. If one half lands exactly on the other, that fold is a line.

Best when

a shape looks balanced and you need to be sure.

The same problem, other ways