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Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.

  • math -

    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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