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在几何问题中,经常要证明两条线段相等或两个三角形全等,这类问题往往可以通过旋转变换来解决,现举例说明. 一、证明一条线段等于其它两条线段之和例1 如图1,已知E、F分别是正方形ABCD中BC、CD边上的
In geometric problems, it is often necessary to prove that two line segments are equal or that two triangles are equal. This type of problem can often be solved by rotation transformation. Here is an example. First, prove that a line segment is equal to the sum of the other two line segments. 1. It is known that E and F are respectively on the sides of BC and CD in the square ABCD.