合同变换(也叫正交变换)是使相等图形叠合的变换,它保持距离和角度的不变.合同变换体现了数学中运动、变化的思想,有利于揭示图形间的内在联系,在证明、求轨迹、解作图题等方面都有广泛应用.一些复杂的几何问题,若能灵活地运用合同变换,就能把分散的条件集中起来,使图形隐蔽着的关系明朗化,为顺利解题创造条件. Contract transformation (also known as orthogonal transformation) is the transformation that makes equal figures superimposed. It keeps the distance and the angle unchanged. The contract transformation embodies the thought of movement and change in mathematics, which helps to reveal the intrinsic relations between graphs. , Tracking, solving graphs, etc. are widely used. Some complex geometric problems, if you can flexibly use the contract transformation, can concentrate the conditions of the dispersion, so that the relationship between the hidden features of the graph become clear, for the smooth solution Problem creating conditions.