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【OG20-P153-52题】
A flat patio was built alongside a house as shown in the figure above. If all angles are right angles, what is the area of the patio in square feet?
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题目：如图，在一个房子周围建造一块儿庭院，假设图上显示的所有角都是直角，求庭院的面积。
解：由图上数据可知，庭院与房子重合部分为边长为20英尺的正方形（35-15；40-20）。因此庭院面积就等于40*35-20*20=1000英尺。
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