book Maths Puzzle Numerical Ability

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?

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book Other Question

Find the area of a parallelogram ABCD, given that AB = BE = ED = 1, and angle ABE = 90 degrees. My question says to solve the system of this inequalitie by graphing.
Y>/X+1/
(the > has a line underneath of it.) ( / means the lines that go straight up and down.)

I d