Question

if ac = 36 and bc = 21, find ab.
ab = ?

Explanation:

Step1: Use the segment addition postulate

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

Step2: Solve for \(AB\)

Rearrange the formula to \(AB=AC - BC\). Substitute \(AC = 36\) and \(BC = 21\) into the formula: \(AB=36 - 21\).

Answer:

\(15\)