What is the length of BC

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The diagram shows a trapezium ABCD with AB parallel to DC. E is a point on AD such that DE is

perpendicular to DC. The length of AD is x cm and the length of DE is y cm.


Given that:

The area of triangle AED is x²/4

The area of the trapezium ABCD is x² + 16cm^2


Find an expression for the length of BC in terms of x

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