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Symmetry

The big picture

Here is the whole track, on one page.

Symmetry — the whole chapter on one screen
IdeaRememberExample
Fold and matchA fold line lands a shape exactly on itself.Fold a heart in half — both sides match.
Not every middle lineEqual halves are not matching halves.A rectangle's corner-to-corner line fails.
How manyNone, one, several, or never-ending.A square has 4. A circle never stops.
Symmetry around usLetters fall into four groups.H folds both ways. F folds neither.
TurningOrder counts the matching turns in a full circle.A square's order is 4.
Complete itEach missing square sits the same distance the other side.7 squares plus their 7 partners make 14.

Now open Chapter 9 of your textbook, Symmetry. You have already folded, counted and turned the ideas in it.

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This track

  1. 0 Start here
  2. 1 Fold it, and it matches
  3. 2 Not every middle line
  4. 3 How many fold lines?
  5. 4 Symmetry around us
  6. 5 Matching partway through a turn
  7. 6 Half a picture decides the rest
  8. 7 The big picture
  9. 8 Track quiz

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