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题求等腰直角三角形中两直角边的中线所成钝角的度数.(精确到1’) (高一(下)P151B组T7) 分析此题编排在《平面向量》一章,显然是作为向量知识应用而提出的.简单的求法是建立平面直角坐标系,通过得解.
Find the degree of obtuseness of the centerline of two right-angled triangles in an isosceles right-angled triangle. (Accurate to 1’) (Higher one (lower) P151B group T7) Analysis This question is organized in the chapter “Plane Vectors”, apparently as vectors. The simple solution to the application of knowledge is to establish a plane rectangular coordinate system and obtain solutions.