Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10:
ISBN 13:

Chapter 9 - Section 9.4 - Polyhedrons and Spheres - Exercises - Page 427: 44

Answer

Infinite

Work Step by Step

You can draw infinitely many common tangent planes around two externally tangent spheres so there are infinitely many common tangent planes.
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