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OpenStudy (anonymous):
find the area of a quadrilateral ABCD,has angle C = 90degrees,AB= 10cm,BC =15cm,CD=6cm and AD = 8cm.
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hartnn (hartnn):
can you find the area of triangle, when all 3 sides are known ?
hartnn (hartnn):
|dw:1365072537724:dw| using pythagoras theorem, you'll know side BD
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