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中考中常有三角形三边的问题,求解的问题比较广泛,有求边的取值范围,有求组成三角形的个数,还有等腰三角形问题,更有和其他问题结合的综合问题.求解此类问题时特别要注意三角形中两边之和大于第三边,两边之差小于第三边.在解等腰三角形的问题时,还应注意哪两边是腰,或要进行分类讨论.还有一些涉及三边,判断三角形形状的综合问题.下面请看这类问题的解法.一、求边的取值范围例1已知三角形的两边长为4,8,则第三边的长
There are often triangle problems in the senior high school entrance examination, solving a wide range of problems, the range of seeking edges, the number of seeking to form a triangle, as well as the isosceles triangle, more integrated with other problems. Particular attention should be paid to the problem of the class triangle on both sides of the sum is greater than the third side, the difference between the two sides is less than the third side. In solving the isosceles triangle problem, you should also pay attention to which side is the waist, or to be classified discussion. Involving three sides, to determine the synthesis of the triangle shape problem. See below the solution of this type of problem. First, find the edge of the range of Example 1 known length of both sides of the triangle is 4,8, then the length of the third side