Question

c is the midpoint of $overline{ad}$. b is the midpoint of $overline{ac}$. ab = 14. what is the length of $overline{cd}$?

Explanation:

Step1: Find the length of AC

Since B is the mid - point of AC and AB = 14, then AC = 2AB.
$AC=2\times14 = 28$

Step2: Find the length of CD

Since C is the mid - point of AD, then AC = CD.
$CD = 28$

Answer:

28