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May 4th, 2017, 04:30 PM  #1 
Newbie Joined: May 2017 From: US Posts: 3 Thanks: 0  College Level Placement Pretest
Can someone please explain why the answer is E and show the work step by step? I would very much appreciate it.
Last edited by skipjack; May 5th, 2017 at 01:43 AM. 
May 4th, 2017, 05:17 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,518 Thanks: 1240 
sides are proportional because the smaller triangle is similar to the larger one 10/AD = 8/10 8AD = 100 AD = 12.5 btw ... not a 306090 triangle; it is a 6810 Pythagorean triple 
May 5th, 2017, 01:50 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 16,954 Thanks: 1256 
The diagram should show that DE is parallel to BC or perpendicular to AE.


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