#### Answer

Midpoint.

#### Work Step by Step

As d(P,Q) is equal to d(Q,R) and the points lie on the same line, Q is the middle of that line and therefore is the midpoint of the line segment.

Published by
Pearson

ISBN 10:
0-32193-104-1

ISBN 13:
978-0-32193-104-7

Midpoint.

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