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同学们学习了多边形,掌握了常见图形的面积求法。可是在多边形世界中,有些趣题却不能用常规方法解答。下面我们一起来看看吧。【例1】如图1,用一个正方形和两个小直角三角形正好拼成一个大直角三角形,两个小直角三角形的斜边长分别是5厘米和8厘米。这两个小三角形面积之和是多少平方厘米?【分析与解】按常规思路,可以分别求两个小直角三角形的面积,再相加。可是一观察发现,两个小直角三角形的底和高都不知道,仅知道斜边的长
Students studied the polygons, master the area of common graphics algorithm. However, in the polygonal world, some interesting topics can not be solved by conventional methods. Let’s take a look at it Example 1 As shown in Fig. 1, a square and two small right-angled triangles form exactly one large right-angled triangle. The hypotenuse lengths of the two small right-angled triangles are 5 cm and 8 cm, respectively. The sum of these two small triangle area is the number of square centimeters? [Analysis and Settlement] According to the conventional idea, you can separately seek the area of two small right triangle, and then add. However, an observation found that the bottom of two small right triangles and high do not know, only know the length of hypotenuse