Maya decides to use the method of proportions and similar triangles
to find the height of a tower. She measures the length of the tower's
shadow and finds it is 20 feet long. Then she holds a 12-inch ruler
perpendicular to the ground and finds that it casts a 4-inch shadow.
How tall is the tower?
a. 2.4 ft c. 60 ft
b. 5 ft d. 240 f