Pi Day and Finally, Actually Using Pi in Real Life


Recently I wanted to make a round bottom drawstring bag. Trying to make the bottom fit the sides is not easy, as I have tried this before without a pattern. So I started searching for methods to make this easier.

I came across a wonderful site that explains mathematically how to calculate the circle and the rectangle for the bag. Genious! Of all things, Pi is involved. I learned about Pi in school, way back when. I never really gave it any thought after the lessons and tests were over. When would I ever use that again? Well, I finally got to use Pi to figure out my bag calculations. The whole formula was amazing and my bag turned out perfect! Maybe teachers should show their students the practical uses for Pi…

For the worksheet to help make a cylinder bag go to:


From: Michelle at: BirdCage and Thread (YouTube video: How to Calculate Pieces to Sew a Cylinder