Math · AnglesVISUAL DISCOVERY 06 OF 1,100
Flatten Three Corners
Builder · about 6 minutes · a little curiosity goes a long way
For grown-ups
Today’s little discovery
Tear off the three corners and place their vertices together. They form a straight angle, so the three interior angles always add to 180°.
Try a skinny and a wide triangle to test the invariant.
This is a learning model. Try the take-home activity together.Voice settings
Using Heart (en-US).
Your selected voice and opening narration get ready when the page opens with Sound on. The first visit downloads a voice model (about 92 MB), which your browser can cache. No lesson text is sent to a speech service.The sample plays once and does not change the Sound on/off setting.- Wonder
- Guess
- Try it
- Discover
- Celebrate
HERE’S A LITTLE WONDER…
What happens when a triangle's corners meet on a line?
Three paper corners leave their triangle and gather side by side.
No rush. Try an idea and see.