Math Problem (Level 2) : Triangle in rectangle (JJ52)

As shown in the figure below, the triangle AEF is in rectangle ABCD. 

The area of the triangle AEF is 30cm2

The points E and F are on the side BC and CD, respectively and are BE = 8cm and DF = 4cm. 

Find the area of rectangle ABCD at this time.







Answer
92 cm2