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各种与图形有关的问题中,角的变化是最丰富的,在角的变化中,又往往以角的位置变化为基础.要想在变化中寻找本源,就要对角进行转化,就要在学习中注意积累常用结论和基础图形.人教版数学教科书七年级下册第36页第7题:如图1,平行线a、b被直线c所截,知道∠1～∠8中一个角的度数,能否求出其他角的度数?如果能,用其中一个角表示其他各角.
Among the various problems related to graphics, the change of angle is the most abundant. In the change of angle, it is often based on the change in the position of the angle. To find the source in the change, we must transform the corner. In learning, pay attention to accumulating common conclusions and basic graphs. PEP Mathematics Textbook Grade 7 Lower Level Book Page 36 Question 7: As shown in Figure 1, the parallel lines a and b are intercepted by the straight line c, knowing one of the 1 to 8 The degree of the angle, can we find the degree of other angles? If so, use one of the angles to represent the other angles.