What you do is you draw out the first line(I'll ume that's AB) using the ruler. Using the ruler you open the comp so there is five centimeters between the spike and the pen. Now place the spike on one endpoint of segment AB and draw a circle. Now reset the comp to 10 cm and do the same thing on the other end point. The third corner of your triangle is the point where the two circles intersect. Using the ruler connect the end points of segment AB with this point. Done.
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