Six seeds / S-4
Shapes can move
Cut, slide, turn or flip a shape and its area stays the same; two equal triangles make a parallelogram.
Grows into: Area formulas, Pythagoras, proof, transformations
6 videos
- 2 Is 3×4 the Same as 4×3? Coming soon
- 4 The Distributive Law Is Just One Cut Coming soon
- 5 What Long Multiplication Is Really Doing Coming soon
- 11 Parallelogram Area: One Cut, One Slide Coming soon
- 12 Where Does the ½ in Triangle Area Come From? Coming soon
- 15 Why Is a Negative Times a Negative Positive? Coming soon