CN202632593U - Circumference and radius relation demonstrating instrument - Google Patents
Circumference and radius relation demonstrating instrument Download PDFInfo
- Publication number
- CN202632593U CN202632593U CN 201220324162 CN201220324162U CN202632593U CN 202632593 U CN202632593 U CN 202632593U CN 201220324162 CN201220324162 CN 201220324162 CN 201220324162 U CN201220324162 U CN 201220324162U CN 202632593 U CN202632593 U CN 202632593U
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- Prior art keywords
- circumference
- circle
- radius
- relation
- demonstrating instrument
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Abstract
The utility model provides a circumference and radius relation demonstrating instrument, and relates to the technical field of math teaching aids. The circumference and radius relation demonstrating instrument consists of a rectangular plate, 2-5 circles with inner grooves and a nonelastic rope, wherein scale marks are carved on one side of the rectangular plate in the length direction and the width direction; and a fixing hole is formed in the intersection of the length direction and the width direction. Preferably, the circles with the inner grooves and the rectangular plate are connected with one another through the fixing hole. Further, the sizes of the 2-5 circles are different. Compared with the prior art, the circumference and radius relation demonstrating instrument has the advantages that the circumference of each circle can be measured by filling the nonelastic rope in the groove in the circle, after the nonelastic rope is unfolded, the length of the nonelastic rope can be measured quickly, and then the relation between the circumference of each circle and the diameter (or the radius) of the circle can be calculated; and the circumference and radius relation demonstrating instrument is convenient to use and easy to improve, and is a teaching aid with quite high popularization value.
Description
Technical field
The utility model relates to a kind of mathematics teaching aid, is circumference and radius relationship demonstration device specifically.
Background technology
In mathematical education, need area and the girth of circle and the relation between the radius of explanation circle, traditional way is to tell the student formula, lacks intuitive, is unfavorable for students'understanding, remembers insecure.
The utility model content
The purpose of the utility model is to the deficiency of existing teaching, and a kind of circumference and radius relationship demonstration device are provided.
The purpose of the utility model realizes through following technological means: circumference and radius relationship demonstration device; Circle and nonelastic rope by rectangular slab, band circle inner groovy are formed; Long and the wide scale mark that is carved with of one side of rectangular slab, there is a fixed orifice long and wide scale mark intersection.
As preferably, be with the circle of circle inner groovy to be connected through fixed orifice with rectangular slab.
Further, said circle is 2～5 that vary in size.
Compared with prior art the utlity model has following tangible advantage: can measure round girth through nonelastic rope being filled the circle inner groovy; The length of nonelastic rope can be measured fast after the expansion, and then the relation between circumference and the diameter of a circle (perhaps radius) can be calculated; Easy to use, be easy to improve, be a kind of teaching aid that promotional value is arranged very much.
Description of drawings
Fig. 1 is the utility model synoptic diagram.
Wherein 1. rectangular slabs are 2. round, 3. justify inner groovy, 4. nonelastic rope, 5. scale mark, 6. fixed orifice.
Embodiment
Below in conjunction with description of drawings the utility model is done further to describe in detail:
This circumference with the use of radius relationship demonstration device is: nonelastic rope 4 is wrapped in round inner groovy 3 inside; The girth of having represented corresponding circle 2 will justify 2 around fixed orifice 6 rotations, can measure the diameter of circle 2 through scale mark 5; One end of nonelastic rope 4 is taken out; One end is at fixed orifice 6 places, and the other end is stretching at scale mark 5 places, the long limit of rectangular slab 1, can measure the length of nonelastic rope 4; Be the girth of corresponding circle 2, and then can calculate the relation between round girth and the radius (or diameter); Change the circle 2 of different sizes, can further verify the ubiquity of circumference and radius formula.
In a word, the utility model provides circumference and radius relationship demonstration device.The above; Be merely a part of embodiment of the utility model; The protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.
Claims (2)
1. circumference and radius relationship demonstration device; Circle (2) and nonelastic rope (4) by rectangular slab (1), band circle inner groovy (3) are formed; It is characterized in that: the long and wide scale mark (5) that is carved with of a side of rectangular slab (1), there is a fixed orifice (6) long and wide scale mark (5) intersection.
2. circumference according to claim 1 and radius relationship demonstration device is characterized in that: the circle (2) of band circle inner groovy (3) is connected through fixed orifice (6) with rectangular slab (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220324162 CN202632593U (en) | 2012-06-28 | 2012-06-28 | Circumference and radius relation demonstrating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220324162 CN202632593U (en) | 2012-06-28 | 2012-06-28 | Circumference and radius relation demonstrating instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202632593U true CN202632593U (en) | 2012-12-26 |
Family
ID=47385761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220324162 Expired - Fee Related CN202632593U (en) | 2012-06-28 | 2012-06-28 | Circumference and radius relation demonstrating instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202632593U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000070A (en) * | 2012-12-30 | 2013-03-27 | 曹雨晴 | Demonstration device of relationship of radius and perimeter of circle |
| CN106781886A (en) * | 2016-12-15 | 2017-05-31 | 顾登慧 | Oval perimeters law verifies instructional device |
-
2012
- 2012-06-28 CN CN 201220324162 patent/CN202632593U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000070A (en) * | 2012-12-30 | 2013-03-27 | 曹雨晴 | Demonstration device of relationship of radius and perimeter of circle |
| CN103000070B (en) * | 2012-12-30 | 2014-07-09 | 曹雨晴 | Demonstration device of relationship of radius and perimeter of circle |
| CN106781886A (en) * | 2016-12-15 | 2017-05-31 | 顾登慧 | Oval perimeters law verifies instructional device |
| CN106781886B (en) * | 2016-12-15 | 2019-05-28 | 顾登慧 | Oval perimeters law verifies instructional device |
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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: 20121226 Termination date: 20130628 |