Question

if ac = 23 and bc = 19, find ab.
23
a b c
19
ab = ?

Explanation:

Step1: Use segment addition postulate

From the figure, we know that \(AC = AB + BC\).

Step2: Solve for \(AB\)

Rearrange the formula to \(AB=AC - BC\). Substitute \(AC = 23\) and \(BC = 19\) into the formula: \(AB=23 - 19\).

Answer:

\(4\)