The figure shown below is an example of ratio and proportion. A ratio is a comparison between two different things. A proportion is two ratios that have been set equal to each other. Note that in the figure shown below, the form and angle of quadilateral ABCD is similar to quadilateral EFGD. So if we have angle ABC, it is proportional to angle EFG or angle E. From the question, angle CGF is proportional to angle GDE or angle D.
Quadilateral ABCD is similar to quadilateral EFGD Help?