几何计算问题，大都是结合图形性质，利用几何性质和公式进行计算的．如计算线段的长，大都是把它转化为直角三角形的边，然后利用句股定理或利用平行线、角平分线、切，割线及相似形造成的比例关系，或利用有关公式进行计算．而角的计算，大都利用三角形内角和、特殊角三角函 The problem of geometric calculation is mostly combined with the nature of the graph, using geometric properties and formulas for calculation. For example, the length of a line segment is calculated by converting it to a right-angled triangle edge, and then using the sentence stock theorem or using the proportional relationship caused by parallel lines, angle bisectors, cuts, secants, and similar shapes, or using related formulas. The calculation of angles mostly uses triangular inner angles and special angle triangles.