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Thanks

 May 19, 2018
edited by Johnnyboy  May 19, 2018
 #1
avatar+988 
+2

B, RDF is a right triangle. 

 

 

Angle RDF is right, so triangle RDF must be a right triangle.

 

The proof is here: https://www.youtube.com/watch?v=z3YXznrwtp8 

 

I hope this helped,

 

Gavin

 May 19, 2018
edited by GYanggg  May 19, 2018
edited by GYanggg  May 19, 2018
edited by GYanggg  May 19, 2018
 #2
avatar+2341 
+2

When many segments are named, and there is a lot of information conveyed in a succinct manner, I would suggest creating a diagram that represents the situation. The diagram below does just that:
 

 

 

 

 

What can you conclude about this diagram, and how can you apply it to the answer choices? 

 May 19, 2018

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