一般来说,解答图形旋转问题要注意以下三点:第一,旋转要确定旋转点。一个图形往往有不同的顶点,因此在将图形旋转时要弄清绕哪个点进行旋转。例如:上面图中的三幅图都是把黑色的三角形进行旋转后得到的,图1是绕B点旋转的,你知道图2、图3分别是绕哪个点旋转的吗?第二,旋转要明确方向。一个图形可以沿顺时针方向旋转,也可以 In general, to answer the question of graphics rotation should pay attention to the following three points: First, the rotation to determine the rotation point. A drawing often has different vertices, so when drawing the figure, make sure what point to rotate around. For example: the above three figures are black triangles are rotated after, Figure 1 is rotated around the B point, you know Figure 2, Figure 3, respectively, which is around the point of rotation? Second, the rotation To clear the direction. A graphic can be rotated clockwise, it can be