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: ?)

Step-by-step explanation:

$$\begin{gathered} S_1=27{\text{cm}}^2 \\ {S}_1=a\cdot h\mathrm{/}2 \\ S={\displaystyle \frac{a+c}{2}}\cdot h \\ c=? \\ S=S_1+S_2 \\ S=? \end{gathered}$$

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