Question

Using the diagram below, determine the length of AB if ABC ADE, AD = 4, AE = 5, and AC = 7.

Answer 1

ABC congruent with ADE?
AD/AE = AB/AC
4/5 = AB/7
AB = 28/5 = 5.6

Answer 2

as ABC and ADE are similar triangles so their sides will be proportional..
so, AD/AE=AB/AC
=>4/5=AB/7
therefore, AB=28/5=5.6

Answer 3

do you get it?

Answer 4

Um well, Not all that much. I get all of it up to 28/5=5.6

Answer 5

check out the link http://www.mathsteacher.com.au/year9/ch13_geometry/08_similar/similar.htm
hope this would help