Answer
The missing blanks are as follows:
1. $\frac{DG}{DE} = \frac{DH}{DF}$; Given
2. Identity Property
3. SAS Similarity Theorem
4. Angle DGH is congruent to angle E; CASTC
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 5 - Section 5.3 - Proving Triangles Similar - Exercises - Page 242: 20
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