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Fine the area of the shaped trapezium in the rectangle below

Fine the area of the shaped trapezium in the rectangle below-example-1

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At first find the area of rectangle:
(x + 4)*(x + 1) = x^2 + 5x + 4
Then find the area of triangle:

((x+1)(x-3))/(2) = (x^2-2x-3)/(2)
Then you must do like this
Area of rectangle - Area of triangle = Area of the shaded
x^2+5x+4 - (
(x^2-2x-3)/(2))
User Emiliano Martinez
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