They are very similar ... They all show a difference between two values as a percentage of one (or both) values.| Math is Fun
How to estimate Pi by dropping a match. ... A few hundred years ago people enjoyed betting on coins tossed on to the floor would the coin| www.mathsisfun.com
Geometry is all about shapes and their properties. If you like playing with objects, or like drawing, then geometry is for you!| Math is Fun
Draw a circle with a diameter (all the way across the circle) of 1 ... Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi| www.mathsisfun.com