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1.图1可以看做是一个等腰直角三角形旋转若干次而形成的,则每次旋转的度数可以是( ). A.90°B.60°C.45°D.30°2.对下面各组中的两个图形,可经平移变换由一个图形得到另一个图形的是( ).
1. Figure 1 can be seen as an isosceles right angle triangle formed several times, then the degree of each rotation can be (). A.90°B.60°C.45°D.30°2. The two graphics in each of the following groups can be translated from one graphic to another graphic ().