Question
Triangle ABC and triangle DBC share the same base BC. The height of the triangle ABC is 4 times the height of Triangle DBC. Given that DE is 5 m and BC is 20 m, find the area of the shaded part.
4 m

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Triangle ABC and triangle DBC share the same base BC. The height of the triangle ABC is 4 times the height of Triangle DBC. Given that DE is 5 m and BC is 20 m, find the area of the shaded part.