Question
In the figure. CDEF is a rectangle. The ratio of the length of AD to the length of CD is 3 : 4. B is the mid-point of DF. The area of rectangle CDEF is 240 cm2. What is the area of the shaded part?
4 m

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In the figure. CDEF is a rectangle. The ratio of the length of AD to the length of CD is 3 : 4. B is the mid-point of DF. The area of rectangle CDEF is 240 cm2. What is the area of the shaded part?