math question

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1

<p>in triangle ABC, AB = AC, E is the midpoint of AB, and D is the midpoint of AC. if AE = x and ED = 4, what is the length of BC?</p>

<p>can someone explain to me why the answer is 8?</p>

<p>this is question 9 in section 8 of the 08-09 practice booklet if you want to see the figure because i dont know how to put it on here</p>

2

<p>Triangle AED and Triangle ABC are congruent and have the same angles. Thus their side measures are proportional. If AE=2 and E is the midpoint, that means AB=4 or double. So likewise, if ED=4, BC is double or 8.</p>

3

<p>thanks for the explanation</p>

4

<p>Try this page
<a href="http://talk.collegeconfidential.com/sat-preparation/552018-math-q.html%5B/url%5D"&gt;http://talk.collegeconfidential.com/sat-preparation/552018-math-q.html&lt;/a&gt;&lt;/p>