Mysterious area

The trapezoid ABCD is given. Calculate its area if the area of the DBC triangle is 27 cm2.

Result

S = cm2 (Correct answer is: ?) Wrong answer

Solution:

S1=27 cm2 S1=a⋅ h/2  S=a+c2⋅ h c=? S=S1+S2 S=?

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