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What is the missing reasons in the proof?

What is the missing reasons in the proof?-example-1
User Muhfred
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2 Answers

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Substitution the problem
User Despecher
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answer:

substituion property or transitive property

Explanation:

  • we already knew that <ABC was 90 degrees, therefore all we had to do was substitute, therefore transitive property
User Kouton
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