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November 22, 2014

November 22, 2014

Posted by **leena** on Thursday, September 5, 2013 at 1:19pm.

- geometry -
**Graham**, Friday, September 6, 2013 at 9:20amMissing information: presumably A, D, B are colinear.

For right angle XYZ, |∆XYZ|=(1/2)(XY×YX)

So:

|∆ABC|-|∆ADE| = (1/2)(AB×BC)-(1/2)(AD×DE)

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