CN201655097U - Circumferential angle demonstration device - Google Patents
Circumferential angle demonstration device Download PDFInfo
- Publication number
- CN201655097U CN201655097U CN2010201609283U CN201020160928U CN201655097U CN 201655097 U CN201655097 U CN 201655097U CN 2010201609283 U CN2010201609283 U CN 2010201609283U CN 201020160928 U CN201020160928 U CN 201020160928U CN 201655097 U CN201655097 U CN 201655097U
- Authority
- CN
- China
- Prior art keywords
- angle
- demonstration device
- circumference
- circumferential angle
- base plate
- 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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- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model discloses a teaching aid, and particularly relates to a circumferential angle demonstration device, which comprises a bottom plate and an angle metering plate. The bottom plate is provided with a circular ring with angle scales, a circular slide track is arranged on the upper surface of the bottom plate circumferentially, three rolling balls are arranged in the slide track, two extension rods are connected among the rolling balls, the cross joint of the two extension rods and a circle center of the angle metering plate are connected to the same rolling ball via a pin, and one of the extension rods is fixed at a position of 0 degree on the angle metering plate. The circumferential angle demonstration device has the advantages that the demonstration device is convenient in use, and can assist students to visually study definition and rules of circumferential angle and bring convenience for teachers to teach and for students to learn.
Description
Technical field
The utility model relates to a kind of teaching aid, particularly a kind of angle of circumference apparatus for demonstrating.
Background technology
At present, in mathematical education, can run into the angle of circumference of circle and central angle notion and between the course of law, for rigidly connecting the student who touches this part course, understand the comparison difficulty of getting up.Teacher is also relatively harder when teaching.
Summary of the invention
For solving above technical deficiency, the angle of circumference apparatus for demonstrating that the utility model provides a kind of teacher of convenience to impart knowledge to students and the classmate understands.
The utility model is realized by following measure:
A kind of angle of circumference apparatus for demonstrating of the utility model, comprise base plate and Angle protractor, described base plate is the annulus that circumference is provided with angle index, the upper surface of base plate is provided with circular slide rail along circumference, be provided with three balls in the slide rail, be connected with two expansion links between on the described ball, the cross-connection point of two expansion links and the center of circle of Angle protractor are connected on the ball by bearing pin; One of them expansion link is fixed on the position of 0 ° of Angle protractor.
The beneficial effects of the utility model are: easy to use, can learn knowledge such as the definition of angle of circumference part and rule intuitively, and make things convenient for teacher's teaching and student's study.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: 1 base plate, 2 slide rails, 3 balls, 4 expansion links, 5 Angle protractors.
Embodiment
As shown in Figure 1, a kind of angle of circumference apparatus for demonstrating of the present utility model, comprise base plate 1 and Angle protractor 5, base plate 1 is provided with the annulus of angle index for circumference, the upper surface of base plate 1 is provided with circular slide rail 2 along circumference, be provided with three balls 3 in the slide rail 2, be connected with the cross-connection point of 4, two expansion links 4 of two expansion links between on the ball 3 and the center of circle of Angle protractor 5 is connected on the ball 3 by bearing pin; One of them expansion link 4 is fixed on 0 ° the position of Angle protractor 5.During use, ball 3 can slide in slide rail 2, expansion link 4 can stretch, because slide rail 2 is circles, the end points that has also just guaranteed expansion link 4 just ball 3 remains on the same circle, the angle of two expansion link 4 infalls is an angle of circumference, and the radian between two expansion links, 4 another end points is the angle of central angle, can read from the scale on the base plate 1.It is exactly the angle of angle of circumference that throughput gusset 5 measures the angle of coming, and can observe out angle of circumference intuitively and be half of central angle, adjusts the angle of two expansion link 4 infalls, proceeds to verify the rule between angle of circumference and the central angle.
Claims (1)
1. angle of circumference apparatus for demonstrating, comprise base plate (1) and Angle protractor (5), it is characterized in that: described base plate (1) is provided with the annulus of angle index for circumference, the upper surface of base plate (1) is provided with circular slide rail (2) along circumference, be provided with three balls (3) in the slide rail (2), described ball (3) is connected with two expansion links (4) between going up, and the center of circle of the cross-connection point of two expansion links (4) and Angle protractor (5) is connected on the ball (3) by bearing pin; One of them expansion link (4) is fixed on 0 ° the position of Angle protractor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201609283U CN201655097U (en) | 2010-04-16 | 2010-04-16 | Circumferential angle demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201609283U CN201655097U (en) | 2010-04-16 | 2010-04-16 | Circumferential angle demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201655097U true CN201655097U (en) | 2010-11-24 |
Family
ID=43120342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201609283U Expired - Fee Related CN201655097U (en) | 2010-04-16 | 2010-04-16 | Circumferential angle demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201655097U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411862A (en) * | 2011-12-16 | 2012-04-11 | 浙江海洋学院 | Test device for circular triangle probability |
| CN104424834A (en) * | 2013-09-04 | 2015-03-18 | 李广普 | Demonstration teaching aid for theorem of tangent and secant in middle school mathematics |
| CN108062888A (en) * | 2018-02-05 | 2018-05-22 | 史可晗 | A kind of central angle and angle of circumference relation demonstration teaching aid and its demenstration method |
-
2010
- 2010-04-16 CN CN2010201609283U patent/CN201655097U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411862A (en) * | 2011-12-16 | 2012-04-11 | 浙江海洋学院 | Test device for circular triangle probability |
| CN102411862B (en) * | 2011-12-16 | 2013-06-12 | 浙江海洋学院 | Test device for circular triangle probability |
| CN104424834A (en) * | 2013-09-04 | 2015-03-18 | 李广普 | Demonstration teaching aid for theorem of tangent and secant in middle school mathematics |
| CN108062888A (en) * | 2018-02-05 | 2018-05-22 | 史可晗 | A kind of central angle and angle of circumference relation demonstration teaching aid and its demenstration method |
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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: 20101124 Termination date: 20110416 |