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在教学中看到苏科版七年级下册第42页探索研究第20题时,思考:第(1)题属于计算三角形中两内角平分线交角的问题,第(2)题属于计算三角形中两外角平分线交角的问题,在实际教学中增添了计算一内角和一外角平分线交角,还通过一题多解,利用两内角平分线交角的计算公式推理得出其他两种类型交角的计算公式,让学生能熟练掌握三角形中两角平分线夹角的计算公式,以方便以后的计算与证明。
In teaching to see the Su Ke version of the seventh grade on the 42nd page to explore the study of the 20th question, thinking: the first problem (1) is to calculate the angle between the two bisector of the triangle angle problem, the first two (2) belongs to the calculation of the triangle In the actual teaching, the calculation of the angle of intersection of one internal corner and one external corner bisector is added. The calculation of the other two types of corner angles is also inferred by the calculation formula of the angle of intersection of the two internal corners. Formula, so that students can master the triangulation angle bisector angle between the formula to facilitate the calculation and proof later.