The intersection of diagonal AC and BD of trapezoid ABCD and point O, it is known that the top and bottom of trapezoid is 2, and the area of triangle ABO is equal to 2 / 3 of the area of triangle BOC, so the triangle can be obtained Ratio of AOD to BOC area of triangle (Butterfly Theorem) 2 as shown in the figure, in rectangular ABCD, ab = 6, ad = 2, AE = EF = fr, calculate the shadow area one two

The intersection of diagonal AC and BD of trapezoid ABCD and point O, it is known that the top and bottom of trapezoid is 2, and the area of triangle ABO is equal to 2 / 3 of the area of triangle BOC, so the triangle can be obtained Ratio of AOD to BOC area of triangle (Butterfly Theorem) 2 as shown in the figure, in rectangular ABCD, ab = 6, ad = 2, AE = EF = fr, calculate the shadow area one two

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