Answer
Rhombus
Work Step by Step
When we reflect isosceles triangle $ABC$ across line $BC$ we end up with a rhombus. The congruent sides would be $AB=AC=A'B=A'C$, with one diagonal 'drawn' in - diagonal $BC$.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 4 - Review Exercises - Page 215: 35a
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