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2014-07-24T16:59:12+03:00
ΔDEF, mas<E=90
EG _|_ DF
EG-h

EG²=GF *DG

4DG=9GF
DG=9GF/4

12² = 9GF/4 *GF

12= √ 9GF²/4

12= 3GF/2

GF=12*2/3

GF=4*2 =8

DG=9*8/4= 9*2= 18

DF=GF+DG=8+18= 26
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