Answer
x=12
Work Step by Step
Perimeter P= AB+BC+AC
AB=AC because isosceles triangle
on putting values
40= x+x+4+x
3x=36
x=12
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises - Page 160: 33
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