Circumference and π

Launch

Picture a quarter, a dinner plate, and the rim of a Ferris wheel.

For each one, imagine you have a piece of string and you wrap it around. You also measure the distance straight across, right through the middle.

Then you divide:

distance around
distance across

Three different objects, three different sizes. Three ratios.

How will the ratios compare?

Three objects at different sizes — a quarter, a dinner plate, and a Ferris wheel — each shown wrapped with string to indicate the distance around, paired with a measurement of the distance straight across. An arrow between each pair indicates the comparison.
Predict
How will the ratio of the distance around to the distance across for each circle compare to the others?
Or type your own answer
Select an answer or type a prediction to continue
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