论文部分内容阅读
有些图形题,直接用公式去算,无法求出问题的答案,如果添上几条辅助线,问题就迎刃而解了。目:如图1,在长方形ABCD中,EF平行AC,如果三角形BFC的面积是28平方厘米,那么三角形AEB的面积是多少平方厘米?【分析与解】连结AF,三角形AFC与三角形BFC同底等高,所以三角形AFC与三角形BFC的面积相等;连结CE,因为EF平行AC,三角形AFC与三角形AEC同底等高,它们的面积也相
Some graphical questions, the formula directly to count, unable to find the answer to the question, if you add a few auxiliary lines, the problem is solved. Head: As shown in Figure 1, in a rectangular ABCD, EF parallel AC, if the triangle BFC area is 28 square centimeters, then the area of the triangle AEB is how many square centimeters? [Analysis and solution] link AF, triangular AFC and triangle BFC So the area of triangle AFC and triangle BFC are the same; connect CE, because EF is parallel to AC, triangle AFC and triangle AEC are the same height at the end, and their area is also