CN2742514Y - 'Circle' teaching demonstrator in plane geometry - Google Patents
'Circle' teaching demonstrator in plane geometry Download PDFInfo
- Publication number
- CN2742514Y CN2742514Y CN 200420034998 CN200420034998U CN2742514Y CN 2742514 Y CN2742514 Y CN 2742514Y CN 200420034998 CN200420034998 CN 200420034998 CN 200420034998 U CN200420034998 U CN 200420034998U CN 2742514 Y CN2742514 Y CN 2742514Y
- Authority
- CN
- China
- Prior art keywords
- circle
- teaching
- roundel
- connecting link
- plane geometry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a 'circle' teaching demonstrator in plane geometry, comprising a machine frame, a big magnetic circular disc, a small circular disc and a connecting rod. The big magnetic circular disc is installed on the machine frame, the machine frame of the front face of the big magnetic circular disc is designed with the connecting rod, the back face of the small circular disc is provided with a sliding groove through which the small circular disc is sheathed on the connecting rod, and the small circular disc can slide left and right along the connecting rod. The teaching demonstrator has simple material, simple manufacture, convenient operation and visual image and is able to raise the efficiency and quality of the geometric teaching, such as being used for teaching the 'circle' in the plane geometry.
Description
Technical field the utility model relates to a kind of teaching aid, specifically is circle and demonstrator round, circle and linear position relation in a kind of geometry teaching.
Still there is not similar teaching aid in the present Junior High School Geometry teaching of background technology.The teacher by draw on blackboard temporarily, perhaps finishes figure with cardboard when teaching in advance, and last class hour is attached on the blackboard.The interim picture delayed student's time, and a class 45 minutes has just reduced efficient if take out the plenty of time picture.The teacher is drawn on the cardboard in advance, also expends teacher's great effort and the time, and every class all needs to draw, and has increased teacher's burden virtually.
The summary of the invention the purpose of this utility model provide a kind of intuitively, demonstration dynamic, simple in structure circle concerns with the positions of straight line, circle and other figures with circle, circle, the teaching aid of quantitative relation.
In order to achieve the above object, technical solution of the present utility model is the teaching demonstration device of " circle " in a kind of plane geometry, and it comprises frame, magnetic big disk, roundel, connecting link.The magnetic big disk is installed on the frame, and design has horizontal connecting link on the frame of magnetic big disk front, has chute in the roundel back, by chute common roundel is enclosed within on the connecting link, and common roundel can be along the slippage of the connecting link left and right sides.
Also can the connecting link that laterally has chute be arranged by design on frame, design a little axle at the roundel circle centre position, roundel can be around little axle rotation, and little axle can be along the left and right sides slippage of connecting link chute.
Description of drawings
Fig. 1 is the utility model teaching aid front view;
Fig. 2 is the utility model teaching aid right view;
Fig. 3 is the synoptic diagram of the utility model teaching aid demonstration circle and straight line mutual alignment relation;
Fig. 4 is the synoptic diagram of the utility model teaching aid demonstration circle and circle mutual alignment relation;
Fig. 5 be the utility model teaching aid demonstration circle with circle, round and straight line between the synoptic diagram of position and quantitative relation;
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
As Fig. 1-shown in Figure 5, the utility model comprises frame 1, magnetic big disk 3, roundel 4, connecting link 2, on frame 1, be fixed with a magnetic big disk, design has horizontal connecting link on the frame 1 of magnetic big disk 3 fronts, have chute in roundel 4 back, by chute roundel 4 is enclosed within connecting link, but left and right sides slippage roundel.Also can the horizontal connecting link 2 that have chute be arranged by design on frame 1, design a little axle at the circle centre position of roundel 4, roundel can be around little axle rotation, and little axle can be along the left and right sides slippage of connecting link chute.In addition auxilliaryly adds some iron wires (representative line segment) that length differs, each class-letter made of iron can be demonstrated out the position and the quantitative relation of circle and circle, circle and straight line.
As shown in Figure 3, stick iron alphabetical O, L, by moving up and down iron wire L, can demonstrate out intuitively circle crossing, tangent with straight line, from three kinds of positions concern and the variation of distance from the chord to the centre.
As shown in Figure 4, stick iron alphabetical O
1, O
2,, can demonstrate out that circle and circle are outer to be concerned from, circumscribed, crossing, inscribe, five kinds of positions including intuitively by left and right sides slippage roundel.
As shown in Figure 5, stick iron alphabetical A, B, C, O
1, O
2, under the situation of known two radius of circles and line of centres,, allow B point and center of circle O by translation iron wire AB
2Overlap, can try to achieve the length of outside common tangent AB.
Good effect the utility model is drawn materials easily, makes simple, easy to operate, vivid straight See, as be widely used in the teaching of " circle " in the plane geometry, can greatly improve several teaching Efficient and quality.
Claims (4)
1, the demonstration instrument for teaching of " circle " in a kind of plane geometry, it comprises frame, magnetic big disk, roundel, connecting link, it is characterized in that: the magnetic big disk is installed on the frame, design has horizontal connecting link on the frame of magnetic big disk front, have chute in the roundel back, by chute roundel is enclosed within on the connecting link, roundel can be along the slippage of the connecting link left and right sides.
2, the demonstration instrument for teaching of " circle " in the plane geometry according to claim 1 is characterized in that: design has chute on this connecting link, designs a little axle at the roundel circle centre position, and roundel can be around little axle rotation, and little axle can be along the left and right sides slippage of connecting link chute.
3, the demonstration instrument for teaching of " circle " in the plane geometry according to claim 1 and 2 is characterized in that: the auxilliary iron wire that is added with is some, represents line segment.
4, the demonstration instrument for teaching of " circle " in the plane geometry according to claim 1 and 2 is characterized in that: assist and be added with all kinds of iron letters, represent each point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420034998 CN2742514Y (en) | 2004-02-09 | 2004-02-09 | 'Circle' teaching demonstrator in plane geometry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420034998 CN2742514Y (en) | 2004-02-09 | 2004-02-09 | 'Circle' teaching demonstrator in plane geometry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2742514Y true CN2742514Y (en) | 2005-11-23 |
Family
ID=35477982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420034998 Expired - Fee Related CN2742514Y (en) | 2004-02-09 | 2004-02-09 | 'Circle' teaching demonstrator in plane geometry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2742514Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104933926A (en) * | 2014-03-18 | 2015-09-23 | 王谨 | Graph transformation teaching tool |
| CN106373462A (en) * | 2016-12-07 | 2017-02-01 | 泸县奇峰镇学校 | Circle teaching aid for mathematics teaching |
-
2004
- 2004-02-09 CN CN 200420034998 patent/CN2742514Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104933926A (en) * | 2014-03-18 | 2015-09-23 | 王谨 | Graph transformation teaching tool |
| CN106373462A (en) * | 2016-12-07 | 2017-02-01 | 泸县奇峰镇学校 | Circle teaching aid for mathematics teaching |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |