Ответ:
угол EFN=180°- (угол FEN + угол ENF)= 180°-(90°+60°) = 30°
sin EFN 30° = 1/2 , EN = 1/2 FN = 30÷2=15
EL= EN+NL=15+13=28
P MFEL= 28×4=112
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Ответ:
угол EFN=180°- (угол FEN + угол ENF)= 180°-(90°+60°) = 30°
sin EFN 30° = 1/2 , EN = 1/2 FN = 30÷2=15
EL= EN+NL=15+13=28
P MFEL= 28×4=112