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A cube whose side length is 5 is shown below. Let P be on edge AB such that AP = 2, and let Q be on edge AE such that AQ = 1. The plane passing through points C, P, and Q intersects DH at R. Find the length DR.

 Jan 30, 2020
 #1
avatar+11358 
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A cube whose side length is 5 is shown below. Let P be on edge AB such that AP = 2, and let Q be on edge AE such that AQ = 1. The plane passing through points C, P, and Q intersects DH at R. Find the length DR.

 

laugh

 Jan 30, 2020
edited by Omi67  Jan 30, 2020
edited by Omi67  Jan 30, 2020
 #2
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Sorry, but how did you get that QPA and RDC are similar?

Guest Jan 30, 2020
 #3
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Sorry, I mean the big RDC, not the smaller one.

Guest Jan 30, 2020
 #4
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The angles RCD and QPA are equal.
The angles PAQ and CDR are right angles.

 Jan 30, 2020

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