CN202033921U - Teaching aid used for demonstrating that total of any two sides larger than third side of triangle - Google Patents
Teaching aid used for demonstrating that total of any two sides larger than third side of triangle Download PDFInfo
- Publication number
- CN202033921U CN202033921U CN2011201449202U CN201120144920U CN202033921U CN 202033921 U CN202033921 U CN 202033921U CN 2011201449202 U CN2011201449202 U CN 2011201449202U CN 201120144920 U CN201120144920 U CN 201120144920U CN 202033921 U CN202033921 U CN 202033921U
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- CN
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- chi
- ruler
- teaching aid
- triangle
- sides
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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 teaching aid used for demonstrating that the total of any two sides is larger than the third side of a triangle. The teaching aid comprises a first ruler (1), a second ruler (2) and a third ruler (3) which are of rectangular rulers with equal length and equal width, wherein a chute (6) is arranged on the first ruler (1) along the length direction; one end of the second ruler (2) is arranged in the chute (6) by a first articulated shaft (8) in a sliding manner; one end of the third ruler (3) is articulated with one end of the first ruler (1) by a second articulated shaft (5); the first ruler (1), the second ruler (2) and the third ruler (3) are respectively provided with a plurality of through holes (7) which are arranged at equal intervals. The teaching aid can intuitively, vividly and accurately demonstrate the length relation of three sides in one triangle.
Description
Technical field
The utility model relates to a kind of mathematical education apparatus.Be specifically related to a kind of teaching aid of any both sides of triangle sum that be used to demonstrate greater than the 3rd limit.
Background technology
In mathematical education, exercise, the existing teaching aid that is used for demonstration and study " any both sides of triangle sum is greater than the 3rd limit " principle is generally several spillikins that thickness is identical, length is different, by piecing together the relation of understanding, verifying between the Atria length of side of putting.
There are a lot of drawbacks in the teaching of carrying out Atria frontier juncture system in this way, as: the length of spillikin is certain, has only four kinds in the complete learning aid spillikin that provides, and student's choice is less.If the teacher prepares a lot of spillikins to the student,, be difficult to from a lot of spillikins, select rapidly and accurately the spillikin that is fit to length again according to pupil's observation ability.Spillikin has thickness for another example, and pendulum gets up to have error.The student who has puts into one " triangle " to three spillikins of 4cm, a 5cm, 9cm, and this and teaching task run in the opposite direction, and have played retroaction.
The utility model content
Technical problem to be solved in the utility model is, a kind of teaching aid of any both sides of triangle sum greater than the 3rd limit that be used to demonstrate is provided, can straight tube, image, demonstrate Atria edge lengths relation exactly.
It is as follows that the utility model solves the problems of the technologies described above the technical scheme that is adopted:
A kind ofly be used to demonstrate the teaching aid of any both sides of triangle sum greater than the 3rd limit, comprise isometric wide rectangle ruler first chi, second chi and the 3rd chi is characterized in that: offer a chute at the first chi upper edge chi length direction; One end of second chi is slidingly mounted in the described chute by first jointed shaft; One end of the 3rd chi is hinged by an end of second jointed shaft and first chi; At first chi, offer several equidistant through holes on second chi and the 3rd chi respectively.
Also comprise an embolus that is plugged in the described through hole.
Good effect of the present utility model is: when aided education, at first, can increase student's selectivity, every limit all has multiple length to select for the student; Secondly, can help the student to find the corresponding length of side rapidly and accurately, need not from a pile spillikin, select the spillikin of oneself wanting again arduously; The 3rd, error is little, if the length of side is respectively 4cm, 5cm, 9cm, has only ruler to be overlapped three, could pass embolus from the hole, just the problem because of the error mislead students can not occur.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Further specify the utility model below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model comprises three wooden rulers of isometric wide rectangle, if transparent material can be better, as: plastics are respectively first chi, 1, the second chi 2 and the 3rd chi 3.Offer a chute 6 at first chi, 1 upper edge chi length direction.One end of second chi 2 is installed in the described chute 6 by first jointed shaft 8, and this jointed shaft 8 can slide in this chute 6.One end of the 3rd chi 3 is hinged by an end of second jointed shaft 5 and first chi 1.On first chi, 1, the second chi 2 and the 3rd chi 3, offer several equidistant through holes 7 respectively.Also comprise an embolus 4 that is used for being plugged on described through hole 7.
During use, choose the through hole of scale correspondence, in correspondence with each other second chi 2 and the through hole on the 3rd chi 3 are overlapped, plug embolus 4, just form a triangle.
Claims (2)
1. one kind is used to demonstrate the teaching aid of any both sides of triangle sum greater than the 3rd limit, comprise isometric wide rectangle ruler first chi (1), second chi (2) and the 3rd chi (3) is characterized in that: the chi length direction offers a chute (6) in first chi (1) upper edge; One end of second chi (2) is slidingly mounted in the described chute (6) by first jointed shaft (8); One end of the 3rd chi (3) is hinged with an end of first chi (1) by second jointed shaft (5); In first chi (1), offer equidistant several through holes (7) on second chi (2) and the 3rd chi (3) respectively.
2. as claimed in claim 1ly be used to demonstrate the teaching aid of any both sides of triangle sum, it is characterized in that: also comprise an embolus (4) that is plugged in the described through hole (7) greater than the 3rd limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201449202U CN202033921U (en) | 2011-04-29 | 2011-04-29 | Teaching aid used for demonstrating that total of any two sides larger than third side of triangle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201449202U CN202033921U (en) | 2011-04-29 | 2011-04-29 | Teaching aid used for demonstrating that total of any two sides larger than third side of triangle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202033921U true CN202033921U (en) | 2011-11-09 |
Family
ID=44896210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201449202U Expired - Fee Related CN202033921U (en) | 2011-04-29 | 2011-04-29 | Teaching aid used for demonstrating that total of any two sides larger than third side of triangle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202033921U (en) |
-
2011
- 2011-04-29 CN CN2011201449202U patent/CN202033921U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20120429 |