CN203376903U - Variable triangle area demonstration device - Google Patents
Variable triangle area demonstration device Download PDFInfo
- Publication number
- CN203376903U CN203376903U CN201320440068.2U CN201320440068U CN203376903U CN 203376903 U CN203376903 U CN 203376903U CN 201320440068 U CN201320440068 U CN 201320440068U CN 203376903 U CN203376903 U CN 203376903U
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- CN
- China
- Prior art keywords
- stiff end
- fixing end
- elastic string
- panel
- fixedly connected
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- 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.)
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Abstract
The utility model relates to a mathematics teaching aid, which is capable of changing the shape of the triangle without changing the base, the height, and the area. Currently, the teaching aid used for teaching the knowledge points does not exist. In order to overcome the defect of the prior art, the utility model provides a variable triangle area demonstration device. The teaching aid is capable of demonstrating the change of the shape of the triangle, and the base and the height are not changed. The variable triangle area demonstration device is characterized in that a connecting line between a first fixing end and a second fixing end is parallel to a sliding rod, which is provided with a sliding block capable of sliding along the sliding rod; the sliding block is provided with a third fixing end; two ends of a first rubber rope are respectively fixedly connected with the first fixing end and the third fixing end; two ends of the second rubber rope are respective fixedly connected with a second fixing end and a third fixing end; and the plane determined by the first rubber rope and the second rubber rope is parallel to the plane of the panel.
Description
Technical field
The utility model relates to a kind of mathematics teaching aid, in particular for the teaching aid of variable triangle area teaching.
Background technology
Leg-of-mutton area only depends on the end and height, if a triangle, its shape constantly changes, if can guarantee the end and high constant, triangle area is constant, and prior art not yet has the teaching aid of this knowledge point of suitable cooperation.
The utility model content
In order to solve the deficiencies in the prior art, the utility model proposes a kind of variable triangle area apparatus for demonstrating, the utility model can be demonstrated leg-of-mutton shape and change, and the end and high constant.
The utility model solves the technical scheme that its technical matters adopts: variable triangle area apparatus for demonstrating, comprise: the first stiff end, the second stiff end, the 3rd stiff end, the first elastic string, the second elastic string, slide block, slide bar, panel, base, it is characterized in that: panel is fixedly connected with base, panel is provided with the first stiff end, the second stiff end, slide bar, and the line of the first stiff end and the second stiff end is parallel to slide bar, slide bar is provided with the slide block that can slide along slide bar, and slide block is provided with the 3rd stiff end, two ends respectively with the first stiff end of the first elastic string, the 3rd stiff end is fixedly connected with, two ends respectively with the second stiff end of the second elastic string, the 3rd stiff end is fixedly connected with, and the first elastic string and the determined plane parallel of the second elastic string are in plane, panel place.
The utility model is that the teaching aid that the triangle teaching adopts proposes a kind of new technical scheme.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
1-the first stiff end in figure, 2-the second stiff end, 3-the 3rd stiff end, 11-the first elastic string, 21-the second elastic string, 4-slide block, 5-slide bar, 6-panel, 7-base.
Embodiment
Below in conjunction with accompanying drawing, design and use of the present utility model are further illustrated.
Referring to accompanying drawing 1, it is structural representation of the present utility model, variable triangle area apparatus for demonstrating, comprise: the first stiff end (1), the second stiff end (2), the 3rd stiff end (3), the first elastic string (11), the second elastic string (21), slide block (4), slide bar (5), panel (6), base (7), it is characterized in that: panel (6) is fixedly connected with base (7), panel (6) is provided with the first stiff end (1), the second stiff end (2), slide bar (5), and the line of the first stiff end (1) and the second stiff end (2) is parallel to slide bar (5), slide bar (5) is provided with the slide block (4) that can slide along slide bar, and slide block (4) is provided with the 3rd stiff end (3), two ends respectively with the first stiff ends (1) of the first elastic string (11), the 3rd stiff end (3) is fixedly connected with, two ends respectively with the second stiff ends (2) of the second elastic string (21), the 3rd stiff end (3) is fixedly connected with, and the first elastic string (11) and the determined plane parallel of the second elastic string (21) are in panel (6) plane, place.
The first stiff end (1), the second stiff end (2), the 3rd stiff end (3) are to arrange for fixing elastic string, can adopt screw rod to make, and also can adopt cleek to make, as long as fixing elastic string.
Using method: base (7) is placed in lectern, and panel (6) is towards the student, sliding slider (4), and the first stiff end (1), the second stiff end (2), determined triangular shaped the changing of the 3rd stiff end (3), still, the end and high constant.
Various equivalent modifications should be known: elastic string should be exceptionally straight.
The utility model provides a kind of new technical scheme for the teaching aid of triangle teaching.
Claims (1)
1. variable triangle area apparatus for demonstrating, comprise: the first stiff end (1), the second stiff end (2), the 3rd stiff end (3), the first elastic string (11), the second elastic string (21), slide block (4), slide bar (5), panel (6), base (7), it is characterized in that: panel (6) is fixedly connected with base (7), panel (6) is provided with the first stiff end (1), the second stiff end (2), slide bar (5), and the line of the first stiff end (1) and the second stiff end (2) is parallel to slide bar (5), slide bar (5) is provided with the slide block (4) that can slide along slide bar, and slide block (4) is provided with the 3rd stiff end (3), two ends respectively with the first stiff ends (1) of the first elastic string (11), the 3rd stiff end (3) is fixedly connected with, two ends respectively with the second stiff ends (2) of the second elastic string (21), the 3rd stiff end (3) is fixedly connected with, and the first elastic string (11) and the determined plane parallel of the second elastic string (21) are in panel (6) plane, place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320440068.2U CN203376903U (en) | 2013-07-23 | 2013-07-23 | Variable triangle area demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320440068.2U CN203376903U (en) | 2013-07-23 | 2013-07-23 | Variable triangle area demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203376903U true CN203376903U (en) | 2014-01-01 |
Family
ID=49839422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320440068.2U Expired - Fee Related CN203376903U (en) | 2013-07-23 | 2013-07-23 | Variable triangle area demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203376903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718122A (en) * | 2019-11-20 | 2020-01-21 | 徐蓉 | Area demonstration device |
-
2013
- 2013-07-23 CN CN201320440068.2U patent/CN203376903U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718122A (en) * | 2019-11-20 | 2020-01-21 | 徐蓉 | Area demonstration device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 Termination date: 20140723 |
|
| EXPY | Termination of patent right or utility model |