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解直角三角形,即运用直角三角形的边角关系,由已知元素求出未知元素,这部分是初中数学涉及的基本问题之一.主要应用于研究几何图形中的数量关系及测量问题的计算.一、直角三角形的边角关系如图1所示,RtΔABC中,∠C=90°.1.角的关系:∠A+∠B=90°①2.边的关系:a2+b2=c2②图13.边
The solution to the right-angled triangle, that is, the use of the right-angled triangle’s edge relationship, the unknown element is obtained from the known elements. This part is one of the basic problems involved in junior high school mathematics. It is mainly used to study the quantitative relations in geometric figures and the calculation of measurement problems. First, the right-angle triangle of the corner relationship shown in Figure 1, RtΔABC, ∠C = 90 °.1. The relationship between the angle: ∠ A + ∠ B = 90 ° 12. The relationship between the edges: a2 + b2 = c22 Figure 13. side