First, we are going to draw an auxiliary horizontal line; next, we are going to place a protractor at the beginning of our line and draw a point at 60°. Now, we can use a ruler to measure 6 cm in our horizontal line and draw a solid line. Next, we are going to place our rule so the point at the beginning of the rule and the point at 60° lie on the same line; then we are going to measure 7 cm and draw a solid line. Last but not least we can join points A and C drawing a line.