To calculate the perimeter of a shape, like this window, you can add the length of all the sides together. 100cm + 120cm + 100cm +120cm = 440cm Or, you can multiply the length and width by 2.

I had a bit of a problem. I needed to fit my entire body through a hole in a standard piece of printer paper. While this isn't a real problem, it is a fun way to show how the perimeter and area of ...

These days it’s hard to be carry the label “maker” or “hacker” without also being proficient in some kind of CAD- even if the C is for Cardboard. But before there was … ...