Answer
He is not correct.
Work Step by Step
Instead of using SAS, he used SSA. In other words, he incorrectly used the postulate because the angle provided is not "between" the two different sides.
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 - 4-2 Triangle Congruence by SSS and SAS - Lesson Check - Page 230: 6
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