Answer:
The answer to your question is below
Step-by-step explanation:
Data
D (0, b)
E (a, b)
F(a, 0)
G (0, 0)
From this information, we conclude that the diagonals are EG and DF.
To prove that they are congruent we must calculate their length.
dEG = 
dEG = 
dDF = 
dDF = 
Conclusion
The length of EG is equal to the length of DF, so they are congruent.
GANG GANG
Because I am a gangster I throw up blue all the time
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That is 99 degrees if you have the triangle facing the other way