∑MATH WORKSHOPPROOF DESK / OPEN STUDY00 / 03 STEPS

Make the proof
visible.

Choose one idea. Keep its givens on the page. Reveal the next move only when you are ready to see why it works.

NOW ON THE BOARDc² = a² + b²illustrative problem set
SHEET A / THE QUIET DIAGONALREASONING IN THREE MOVES
THE QUESTION

Can the diagonal be proved without measuring it?

known
unknown
GIVENSa = 3b = 4right angle
01

Name the relationship

Next move is folded away
02

Substitute the known lengths

Next move is folded away
03

Take the root

Next move is folded away