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PLEASE HELP !!

What is the missing reason for line 6 in this proof?

PLEASE HELP !! What is the missing reason for line 6 in this proof?-example-1
User Louann
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Answer: Choice D

CPCTC

This acronym stands for "corresponding parts of congruent triangles are congruent". The triangles being congruent leads to their corresponding pieces being the same length. It's like saying if two houses are identical, then the front doors must be identical as well. Notice how this builds off the fact the triangles are proven congruent in line 5.

User ZeroDefect
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