解三角形是高中数学中的一个重要内容,它通常是与三角函数、立体几何以及数列等知识相结合进行考查,下面例析数列与解三角形知识相结合的问题。一、三内角成等差数列若角A、B、C成等差数列,即A+C=2B,又A+B+C=180°,则:1B=60°,A+C=120°,(A+C)/2=60°; Triangulation is a high school mathematics in an important part, it is usually associated with trigonometric functions, three-dimensional geometry and sequence knowledge to examine, the following analysis of the number of triangles and triangles combined knowledge of the problem. First, the three horns into the arithmetic sequence such as angle difference A, B, C into the arithmetic sequence, that A + C = 2B, and A + B + C = 180 °, then: 1B = 60 °, A + C = 120 ° , (A + C) / 2 = 60 °;