Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-3 Measuring Segments - Practice and Problem-Solving Exercises - Page 24: 13



Work Step by Step

According to the Segment Addition Postulate, $RS+ST=RT$. Rearranging the equation by using the Subtraction Property of Equality gives: $RS=RT-ST$. Since $ST=15$ and $RT=40$, we substitute these values into the equation to obtain: $RS=40-15=25$.
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