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人教版八年级数学在第十三章介绍了轴对称的定义和性质。定义:将某个图形(a)沿直线L折叠,如果它能与另一个图形(b)重合,那么就说这两个图形关于直线L成轴对称。性质:轴对称是图形的一种变换,不改变图形的形状和大小。利用轴对称不仅可以给我们画出优美的图形,同时它在我们解决一系列问题时起着非常重要的作用。一、建立模型,解决问题例:p93页(古代问题)古希腊亚历山大城有一位精通数学和物理的学者名叫海伦,一天,一位将军专程来拜访他,向他请教一个百思不得其解的问题:将军经常要从军营出发,先到一条笔直的河边饮马,然后去河岸同侧的司令部开会,应该怎样
PEP 8th grade mathematics in the thirteenth chapter introduced the definition and nature of axisymmetry. Definition: A figure (a) is folded along a straight line L, and if it can coincide with another figure (b), the two figures are said to be axisymmetric with respect to the straight line L. Nature: Axisymmetric is a transformation of graphics that does not change the shape and size of the graphics. Using axisymmetry not only gives us beautiful graphics, it also plays a very important role in our solution to a series of problems. First, the establishment of a model to solve the problem Example: p93 (ancient problems) Alexander the Great, Alexander the Great Have a master of mathematics and physics called Helen, one day, a general made a special trip to visit him and ask him a baffled Question: the generals often start from the barracks, first to a straight river to drink horses, and then go to the ipsilateral headquarters of the river bank meeting, what should be