Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 1 - Section 1.3 - Early Definitions and Postulates - Exercises - Page 27: 26c

Answer

One plane.

Work Step by Step

Through any three non-collinear points lies one plane. Realizing that there are four points listed, the three points B, C, and D are collinear, thus "counting" as only two points (through any two points lies one line). So, chose any two of the three collinear points, and then point A and you have your three non-collinear points to create one plane.
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