Question

What is the length of AC?

Answer 1

The length of AC is 144-x. ;)

Answer 2

if only it were that easy! i tried the cross multiply method but not sure which way it goes

Answer 3

3/51 = x/(144-x)

Answer 4

using AAA method of triangle similarity

Answer 5

The two triangles are similar.

As a result, lengths of corresponding sides are in proportion.

144 - x is to x as 51 is to 3

(144 - x)/x = 51/3

144 - x 17
------- = ------
x 1

144 - x = 17x

Solve for x @jchristinee

After you solve for x, look at the diagram to see one more calculation to do to get AC.