What you need: ruler, protractor, pencil and paper. Use these to construct a triangle when you know the length of 1 side and the 2 angles at each end of it. In this case use the length 8 cm, and the ...
The best way to measure your feet for running shoes is by heading to the shoe store and getting fitted by an expert. But if you need to troubleshoot sizing on your own, all you need is a ruler, paper, ...