Geometry: Common Core (15th Edition)

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

Chapter 1 - Tools of Geometry - 1-7 Midpoint and Distance in the Coordinate Plane - Practice and Problem-Solving Exercises - Page 56: 61



Work Step by Step

Use the distance formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2}$ $d=\sqrt{(-8-0)^2+(20-12)^2+(12-15)^2}$ $d=\sqrt{(-8)^2+(8)^2+(-3)^2}$ $d=\sqrt{64+64+9}$ $d=\sqrt{137}$ $d\approx11.7$
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