The diagram shows a trapezium. Show that x^2+20x=400 The lengths of the parallel sides of the trapezium are x cm and 20cm. The height of the trapezium is 2x cm. The area is 400cm^2.

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You need to remember the area of trapezium such that:

Area trapezium = Area of rectangle + Area of triangle

You need to consider the dimensions of rectangle such that: one of parallel sides of trapezium x is length...

(The entire section contains 108 words.)

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