When the sun casts shadows on different objects at the same time it creates similar right triangles. Examines the similar triangles below: 
How tall is the tree?
What is the Scale Factor from the tree to the person?
What is the Scale Factor from the person to the tree?
+130516 The height, h, is given by :
6/9 = h/ 24 cross-multiply
24*6 = 9h
144 = 9h divide both sides by 9
16 = h
The scale factor from the height of the tree to the height of the person = 6/16 = 3/8
The scale factor from the height of the person to the height of the tree = 16/6 = 8/3
