For each problem, create an equation (proportion) comparing the known sides of one shape to the corresponding sides of its similar partner. For example, if a 9 ft side on one shape corresponds to a 12 ft side on another, and you need to find side that corresponds to 8 ft, your equation is: 9 over 12 end-fraction equals y over 8 end-fraction Solve for the Variables Use cross-multiplication to solve the equations: Find the Punchline