A Teaching Aid for Drawing Perpendicular Bisectors of Line Segments
A technology of vertical bisectors and line segments, applied in the field of teaching tools, can solve problems such as inconvenience in use
Active Publication Date: 2018-06-19
安徽省宿州市第二中学
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Problems solved by technology
[0002] In the process of geometry teaching in middle school mathematics, it is often necessary to make an auxiliary line perpendicular to the line segment. A line segment is divided into two equal line segments from the middle with a straight line, and it is perpendicular to the divided line segment (at a 90° angle), and usually It can only be made with a ruler and compass, or with the help of a scale and a right-angled triangle. This method requires the use of two drawing tools. It is difficult for the teacher to use one hand to fix the two tools at the same time during the demonstration, which is inconvenient to use.
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[0011] Such as figure 1 As shown, the present invention provides a teaching aid for drawing the perpendicular bisector of a line segment, including a bottom edge 10, and the bottom edge 10 is provided with a first sliding edge 20 and a second sliding edge 40 perpendicular to the bottom edge 10. The first sliding edge 20 and the second sliding edge 40 can slide along the bottom edge 10, and the end of the first sliding edge 20 away from the bottom edge 10 is inclined to the end of the bottom edge 10 close to the second sliding edge 40. A soft rope 50 is pulled, and the position of the vertical line on the first sliding side 20 is fixedly provided with a positioning rod 30 pointing to the second sliding side 40, and the positioning rod 30, the second sliding side 40 and the soft rope 50 There is an intersection point between them, wherein the reference line segment of the position of the vertical line on the first sliding side 20 is the length area marked as S in the figure.
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The invention relates to a teaching aid for drawing a perpendicular bisector of a line section, and belongs to the technical field of teaching aids. The teaching aid comprises a bottom edge. A first sliding edge and a second sliding edge are arranged on the bottom edge and perpendicular to the bottom edge; the first sliding edge and the second sliding edge can slide along the bottom edge; a soft rope is arranged between the end, away from the bottom edge, of the first sliding edge and the end, close to the second sliding edge, of the bottom edge in an obliquely pulled mode; a positioning rod pointing to the second sliding edge is fixedly arranged at the position, located at the perpendicular bisector, of the first sliding edge; and an intersection point is formed by the positioning rod, the second sliding edge and the soft rope. According to the technical scheme, when in use, one side, close to the positioning rod, of the bottom edge coincides with a line section to be treated, the second sliding edge is slid to the end point of one side of the line section, and according to the similar triangle principle, when the intersection point of the positioning rod, the second sliding edge and the soft rope appears, the position of the second sliding edge is a perpendicular bisector of the line section to be treated; and the teaching aid is simple in structure, convenient to carry, convenient and fast to operate, and significant in beneficial effect.
Description
technical field [0001] The invention relates to a teaching aid for drawing a vertical bisector of a line segment, belonging to the technical field of teaching aids. Background technique [0002] In the process of geometry teaching in middle school mathematics, it is often necessary to make an auxiliary line perpendicular to the line segment. A line segment is divided into two equal line segments from the middle with a straight line, and it is perpendicular to the divided line segment (at a 90° angle), and usually Drawings can only be made with a ruler and compass, or with the help of a scale and a right-angled triangle. This method requires the use of two drawing tools. It is difficult for the teacher to use one hand to fix the two tools at the same time during the demonstration, which is inconvenient to use. Contents of the invention [0003] In order to make up for the inconvenience of drawing the perpendicular line in the prior art, the present invention provides a simp...
Claims
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IPC IPC(8): B43L13/00
CPCB43L13/001
Inventor 叶菊
Owner 安徽省宿州市第二中学