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Do You know your Trapezoid?

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Master | Next Rank: 500 Posts
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by dtweah » Thu May 14, 2009 3:55 pm
Let ABCD be a trapezoid with altitude of length 6 and bases AB of length 4 and DC of length 8. If P is the point of intersection of the diagonals AC and BD then the distance from P to DC is

(a) 4
(b) 7/2
(c) 9/2
(d) 14/3
(e) there are many possible answers
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by artistocrat » Thu May 14, 2009 8:32 pm
How do you solve this question?
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by dtweah » Fri May 15, 2009 6:33 am
artistocrat wrote:How do you solve this question?
Begin by drawing a very good diagram. Draw all lines and figure out what you are asked to find. Look for relationships and patterns among diagrams in the figure? Is one figure similar to another? Take it from there and see what you come up with.
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Re: Do You know your Trapezoid?

by dtweah » Sat May 16, 2009 9:21 am
dtweah wrote:Let ABCD be a trapezoid with altitude of length 6 and bases AB of length 4 and DC of length 8. If P is the point of intersection of the diagonals AC and BD then the distance from P to DC is

(a) 4
(b) 7/2
(c) 9/2
(d) 14/3
(e) there are many possible answers
OA is A.

The triangles APB and DPC are similar and thus the distance from P to DC is twice the distance from P to AB. Hence the answer is (2/3)(6) = 4.
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by dumb.doofus » Sat May 16, 2009 10:26 am
yes.. good point. the triangles would be always similar with the bases as the parallel sides of a trapezium..
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