Slide it, turn it, flip it
A tailor cuts one sleeve. The pattern is flipped. The other sleeve is cut.
Tap the three moves. Watch the side lengths.
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Step 1 of 4
- The triangle at the start.
- Slid to a new spot. Same three lengths.
- Turned to face a new way. Same three lengths.
- Flipped into its mirror image. Same three lengths.
Three moves
- Slide: move the figure in a straight line.
- Turn: spin the figure round a fixed point.
- Flip: turn the figure over, to make its mirror image.
| Move | What changes | What stays the same |
|---|---|---|
| Slide | Where it sits | Every side and every corner |
| Turn | Which way it faces | Every side and every corner |
| Flip | Left and right swap | Every side and every corner |
No move changes a side or a corner. So the moved figure is still congruent to the start.