切一个正方形怎样能切成三角形平行四边形和梯形

来源：学生作业帮助网编辑：作业帮时间：2024/05/03 17:45:33

切一个正方形怎样能切成三角形平行四边形和梯形
切一个正方形怎样能切成三角形平行四边形和梯形

切一个正方形怎样能切成三角形平行四边形和梯形
切成三角形时,需一刀就行,使正方形保留一个角（不管是过不过另外的角）下刀就可以.
切成平行四边形,需要两刀,两刀必须平行下刀,切掉的每个部分必须有两个角（也可以只过一个角）.
切成梯形,一刀就行,切掉的部分必须有两个角（也可以只过一个角）,这是直角梯形.若要不是直角梯形,需两刀,方法同切成平行四边形,只是两刀不一定平行就行了.

就这样切.

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