Idea 5of 15Builds onFlip across the line
Flip across a flat line
What changes when a shape flips across a side-to-side line?
Today you'll discover
- which way the corners move
- what stays the same
- what a mirror image looks like
Think firstTwo shapes above a side-to-side line
When the kite flips across this line, which way does each corner move?
Decide first, then press Next. Count straight down to the line.
Squared paper with a thick horizontal line across the middle. Above it, a kite and a right triangle whose bottom edge sits on the line. Dashed counts run straight down from each corner to the line and on below it, and the flipped shapes appear below the line, upside down.
See the whole ideathe big idea and the key word, in one place
The big idea
Across a side-to-side line, each corner stays in its column and swaps above for below.
Compare themUp-and-down line: corners move across and keep their rows. Side-to-side line: corners move up or down and keep their columns.
Easy to get wrongThe flipped kite is upside down because it is a mirror image, not because it was turned.
Key word
- mirror image
- a flipped copy: the same shape, facing the opposite way
Ready to use it?
- Flip a shape across a horizontal line.
- Check each corner kept its column.