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一天,数学老师为同学们出了一道趣味数学题:用篱笆围成一个梯形的养鸡场,一条边利用房屋的墙壁(如下图所示),篱笆长52米,求这个养鸡场的面积。玲玲读完题目,又看了图形,她认为:求梯形的面积,一般情况下要知道梯形的上底、下底和高各是多少才能求出。而在这道题里,只告诉我们篱笆的总长度和高的长度,怎么才能求出这个养鸡场的面积呢?
One day, the math teacher gave the students an interesting math problem: using a fence to form a trapezoidal chicken farm, using the walls of the house as shown in the following figure, the fence is 52 meters long and the area of the chicken farm . Lingling read the title, but also read the graphics, she thought: Seeking trapezoidal area, under normal circumstances to know the trapezoid on the bottom, the bottom and the height of how much is to find. In this question, we only tell us the total length and height of the fence. How can we find out the area of the chicken farm?