Today is pi day! pi or π ?
Just for people who don't remember.... It is a mathematical constant, it is 22/7 or 3.141592653589793... Back in the good old school days, when we have to calculate the Area and the Circumference of the circle.
Area (A) = πr2 and Circumference (C) = πd, which r is the radius of the circle and d is the diameter of the circle.
Here is a card for pi day! I was going to use Boris "mad scientist"... but then I was hungry for Chinese... Well, at least I have a bunch of circles, maybe I can measure the radius and diameter with all of the circles and calculate the Area or Circumference.
Have a wonderful Pi Day!