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.
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 9 - Section 9.4 - Polyhedrons and Spheres - Exercises - Page 427: 44
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