Question

If BC = 5 and CD = 26, find AC.

Answer 1

`AC=√(130)`

Explanation:

AC is the geometric mean. Solve it using this proportion:

`(BC)/(AC)=(AC)/(CD)`

Now fill in the values we know:

`(5)/(AC)=(AC)/(26)`

Cross multiply to get

`(AC)^2=130`

That means that

AC =
`√(130)`, which, in decimal form is

AC = 11.40175425