24 Pack plastic protractors: math protractor features an open center and accurate 6 inches ruler across the base ... the minimum accuracy of the angle is 1 degree, each 10 degrees have a clear ...

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 ...