Question

if ac = 23 and bc = 19, 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 \(AC = 23\) and \(BC = 19\) into the formula: \(AB=23 - 19\).

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Answer:

\(4\)