11. IN AN EQUILATERAL TRIANGLE PROVE THAT ANY TWO ALTITUDE ON THE SIDES FROM THE VERTices ARE OF EQUAL LENGTH. 12.in the fig. 10.34 , if ∆ ABC =~ ∆EDF , FIND THE SIX ELEMENTS.
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how many envelopes can be made out of a sheet of paper 125 by 85 cm, if one envelope requires piece of size 17 by 5 cm..
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