You will need:
Triangle grid paper (optional)
4 or 5 different coloured highlighters, pencils, markers or pens.
From youcubed.org - 'Spirolaterals'
Videos created with Christy at Picnic Point PS, Jasmine at Parramatta PS, and Peta at Chipping Norton PS.
Transcript coming soon.
Get ready to make your own spirolaterals!
Write down 3 different sets of numbers that have an odd amount (for example, 1, 4, 2; 7, 5, 3; and 1, 5, 2, 4, 3. It doesn’t matter if the numbers themselves are odd or even – just how many numbers you have.
Write down 3 different sets of numbers that have an even amount (for example, 1, 4; 5, 6, 1, 2; and 8,7)
Draw the different spirolaterals!
What do you notice about your spirolaterals? Record what are noticing.
Transcript coming soon.
Can you find an example of where an odd amount of numbers forms a spiral that doesn’t return to its starting point?
Transcript coming soon.
What happens if we use different paper? Does our conjecture about odd and even amounts, and whether they make a spirolateral return to its starting point, hold true for triangular paper as well? Record your thinking.
Transcript coming soon.