Question

1. if qr = 17 and pr = 21, find pq.

Explanation:

Step1: Use the segment - addition postulate

Assume that point Q lies on line segment PR, then $PR = PQ+QR$.

Step2: Rearrange the formula to solve for PQ

$PQ=PR - QR$.

Step3: Substitute the given values

Given $QR = 17$ and $PR = 21$, then $PQ=21 - 17$.
$PQ = 4$.

Answer:

4