Question

Geometry help
In the diagram below, BC is an altitude of ABD. To the nearest whole unit, what is the length of CD?



A. 52
B. 44
C. 56
D. 58
http://media.apexlearning.com/Images/200702/01/a2a3ab4b-4bae-4169-aa93-733fd79ea614.gif

Answer 1

Here's the theorem you need for this:

Theorem: If the altitude is drawn to the hypotenuse of a right triangle, the length of the altitude is the geometric mean between the lengths of the segments of the hypotenuse.

Answer 2

Solve this equation for x where x = CD.