book Maths Puzzle Numerical Ability

Find the area of a parallelogram ABCD, given that AB = BE = ED = 1, and angle ABE = 90 degrees.

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book Other Question

(x-1)^2/4 +y^2 = 4
What is the equation of the ellipse in general form? The midpoints of square ABCD are connected to form square EFGH. If EF=10units,
what is the area of squareABCD? Could u solve this please?