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A girl wanted to make a rectangular octagon of side 14 cm. She made it from a square piece of a card of size y cm by cutting off four isosceles triangles whose equal sides were x cm each, as shown in the figure below.
(a) Write down an expression for the area of the octagon in terms of x and y.
(b) Find the value of x.
(c) Find the area of the octagon.