You and a friend want to know how much rope you need to climb a large rock. Your friend is 5.5 feet tall and casts a shadow that
is 18 feet long. If the rock casts a shadow that is 209.5 feet long, calculate the height of the rock from the ground. Round your answer to the nearest foot. (Hint: make a drawing) 64 ft
18 ft
210 ft
219 ft
The concept that is useful in order to answer this item is the concept of ratio and proportion. Let x be the height of the rock from the ground. We use the equation below to answer. 5.5 ft / 18 ft = x ft / 209.5 ft The value of x from the equation is 64 ft. Thus, they will be needing approximately 64 ft of rope.
