Question

Theorem: A line parallel to one side of a triangle divides the other two proportionately.

Answer 1

Answer:

c

Step-by-step explanation:

C. BD= 20

Use similar triangles to write a proportion and then cross multiply to solve.

AE: AC = AD:AB

(ONCE YOU KNOW AB YOU CAN SUBTRACT AD FROM AB TO GET BD =20)

So, 15:40 = 12: AB=32.  now 32-12 = 20 so BD = 20