#### Answer

0 or 1.

#### Work Step by Step

Congruent angles can share 0 or 1 sides.
Congruent angles can be two completely separate angles ,or they may have the same vertex and share one side.

Published by
Prentice Hall

ISBN 10:
0133281159

ISBN 13:
978-0-13328-115-6

0 or 1.

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