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10秒装修报价 装修要花多少钱?获得精准报价,省钱30%
168211
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用一个绳子套(要活扣)套在两枚钉子上。如果这个方法不行,绳子上栓一支铅笔。用手电照射,就会获得清晰的投影。两个点可确定一个椭圆,调好手电与玻璃的距离。将铅笔放在你要画椭圆的最远点上,将绳套活扣系*,那就在一小块玻璃板上画出你想要的椭圆,拉直绳套开始画。最好用铅笔描绘投影楼下正解。钉两枚钉子
定两个圆心点就可以了
绷紧长绳,另一头得到的动点轨迹就是椭圆*廓椭圆定义就是一个动点到两个定点之间的距离之和为定值。故在要画的椭圆长轴上找出两个定点(即数学上所说的焦点)用长细绳固定
当已知椭圆形的长和宽时,是可以用计算的方法求出长短半径,根据半径下好料,再进行装订,又快又省料,还标准,算法是根据椭圆公式自己推算的,一句话说不清,QQ2966792287
望采纳,用铁定直接确定好半径后,祝您好运,铅笔就可以画圆了!希望能够帮助到您,细线