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.

How do you find the area of a circle? Can you measure the area of a circle and use that to find a value for Pi?

Why is the area of a circle proportional to the square of its radius? And why is that ratio the same as the ratio of the circumference to the diameter?

I’m curious about how a hockey puck is measured in advanced mathematical terms (Volume, Area and Circumference). Face it, very few people like math.