Answer
$BC=EF=2+6=8$
Work Step by Step
If two triangles are congruent, the corresponding angles and sides are congruent as well. Thus, we find:
$3z+2=z+6 \\
z=2$
Plugging back into the original equation:
$BC=EF=2+6=8$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 4 - Congruent Triangles - 4-1 Congruent Figures - Practice and Problem-Solving Exercises - Page 223: 37
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