Question
Mary folded a rectangular piece of paper, coloured on one side, to form Figure X as shown below. She cut out the folded part A and B into the shape as shown in Figure Y. Find the area of Figure Y.
4 m

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Mary folded a rectangular piece of paper, coloured on one side, to form Figure X as shown below. She cut out the folded part A and B into the shape as shown in Figure Y. Find the area of Figure Y.