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posted by lindsay on Saturday, May 18, 2013 at 7:35pm.
Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.
Area = 0.5*Ef*DF*sinF = 11 cm^2. 0.5*5.5*8*sinF = 11 22*sinF = 11 sinF = 0.5 F = 30o.
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