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20 15 why is the area of △abq in Shandong college entrance examination three times that of △abo?
Triangle area = 1/2* base * height

BO=3DO→S△ABO=3S△ADO=9，S△COD=3S△AOD=9。

If the trapezoid upper bottom is parallel to the lower bottom, then AD‖BC→AO/CO=BO/AO=3 CO=3AO.

→S△BOC=3S△DOC=2*9=27

S trapezoid ABCD= the sum of the areas of four triangles.

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