论文部分内容阅读
教材(浙教版七下)第22页学习了线段垂直平分线的性质:线段垂直平分线上的点到线段两个端点的距离相等.第29页学习了线段垂直平分线的尺规作图,第30页给出了如下练习:如图:直线l表示一条公路,点A、B表示两个村庄.现要在公路上造一个加油站,并使加油站到两个村庄A、B的距离相等,问加油站应建在何处?请在图中标明这个地点,并说明理由.教参给出了如下参考答案:连结AB,作AB的垂直平分线,交l于点P.加油站应建在P处.理由:线段垂直平分线上的点到线段两端点的距离相等(作图略).
Page 22 Learning the Properties of a Line Vertical Bisection: The distance from a point on a line bisecting the line to the distance between two endpoints on the line is equal. Page 29 Learning a ruler for line bisectors , The following exercises are given on page 30. As shown in the figure: Straight line l represents a road, points A and B represent two villages, and a gas station is to be built on the road and the gas station is to two villages A and B The distance is equal, ask the gas station should be built where? Please indicate the location in the picture, and explain the reason .Teach reference is given the following reference: Link AB, AB for the vertical bisector, The station should be built at P. Reasons: The distance between the points on the vertical bisector of the line segment and the two end points of the line segment is equal (for illustration).