Find the diameter and the radius of a circle with a circumference of 465 cm. Give the answer to the nearest centimetre. Use π = 3۰142 or the π button on a calculator.

Remember that the third side — which is equal to 3√2 — is the circle's diameter. We're trying to find circumference, which, as stated earlier, is equal to pi times diameter (c = πd).

Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math teachers love to dream up unique classroom activities to celebrate Pi for it endless opportunity to calculate (3 ...

With the number 3.1418, Archimedes was able to calculate the circumference of a circle, Britannica states. It wasn’t until 1706 the Pi (π) symbol was created by British mathematician William Jones.

Repeat the circumference- and diameter-finding until you have explored a tiny, medium, big and very large circle. Can you find a relationship that is valid for all the tested circles?

Yes, this is essentially the same equation used to find the circumference of a circle if θ is measured in radians (which it should be). If you make θ equal to 2π, then the length is the same as ...