Question

What is the length of AC ?

3ft
4ft
9ft
18ft

Answer 1

ΔACB and ΔMNB are similar. Therefore the corresponding sides are in proportion:

$\dfrac{AC}{MN}=\dfrac{CB}{NB}\\\\MN=9\ ft\\CB=2\cdot3\ ft=6\ ft\\NB=3\ ft$

Substitute:

$\dfrac{AC}{9}=\dfrac{6}{3}\\\\\dfrac{AC}{9}=2\ \ \ \ |\cdot9\\\\AC=18\ ft$

Answer 2

Answer:

The answer is D, 18ft.

Step-by-step explanation:

The length of AC is 18 ft.