Question
Triangle BCD and triangle ECD share the same base CD. The height of the triangle BCD is 4 times the height of Triangle ECD. Given that EF is 3 cm and CD is 20 cm, find the area of the shaded part.
4 m

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Triangle BCD and triangle ECD share the same base CD. The height of the triangle BCD is 4 times the height of Triangle ECD. Given that EF is 3 cm and CD is 20 cm, find the area of the shaded part.