CN201503650U - Semicircle perimeter demonstrator - Google Patents
Semicircle perimeter demonstrator Download PDFInfo
- Publication number
- CN201503650U CN201503650U CN200920047886XU CN200920047886U CN201503650U CN 201503650 U CN201503650 U CN 201503650U CN 200920047886X U CN200920047886X U CN 200920047886XU CN 200920047886 U CN200920047886 U CN 200920047886U CN 201503650 U CN201503650 U CN 201503650U
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- CN
- China
- Prior art keywords
- flat plate
- semicircle
- rectangular flat
- stereotyped
- dull
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Abstract
The utility model relates to a teaching aid, in particular to a semicircle perimeter demonstrator. The semicircle perimeter demonstrator adopts a rectangular flat plate with a frame, wherein a semicircular flat plate is vertically arranged below the left side of the rectangular flat plate, so that the diameter line of the semicircular flat plate is close to the short edge on the left side of the rectangular flat plate; a timber pole is arranged on the back side in the circle center point of the semicircular flat plate and can move in a slide rail by being held by hand; and a slide rail is arranged on the frontal surface of the rectangular flat plate and at the moving trajectory obtained by moving the circle center of the semicircular flat plate on the rectangular flat plate, wherein the straight-line segment of the slide rail is equal to the arc length of the semicircular flat plate, and the diameter line of the semicircular flat plate is pressed on the long edge at the lower bottom of the rectangular flat plate based on the starting and ending point of a segmental arc of the slide rail. The utility model has the benefits that the semicircle perimeter demonstrator makes a strong impression on the students, and the students can further remember the situation of demonstration when the similar exercises appear in the later days, therefore, the accuracy rate of solving a problem is improved.
Description
Technical field
The utility model relates to a kind of teaching aid.
Background technology
For these years, the mode that the mathematics teacher can only lean on language or picture is described the inequality in circumference of half and semicircle that the semicircle area equals the area of a circle in half of circumference to the student, but equal circumference half and circular diameter and.Owing to lack intuitive, always have the student to misuse circumference divided by 2 girths as semicircle.
Summary of the invention
The utility model provides a kind of semicircle girth demonstration device, and semicircle girth demonstration device is a rectangular flat that is provided with frame, erects a semicircle flat board below the left side of rectangular flat, and semicircle dull and stereotyped diameter line is leaned on mutually with the minor face in rectangular flat left side.Be provided with a mope pole at the back side, semicircular centre point position, the confession hand is caught and is moved on slide rail; Positive visible semicircle dull and stereotyped motion track place of mobile gained on rectangular flat, the center of circle of rolling at rectangular flat promptly establishes a slide rail, the straight-line segment of slide rail equates that with semicircle dull and stereotyped arc length the terminal of the segmental arc of slide rail just in time is that semicircle dull and stereotyped diameter line is pressed on the long limit of going to the bottom of rectangular flat.At this moment, the semicircle dull and stereotyped whole line balls on the following long limit of rectangular flat on the rectangular flat are the semicircle dull and stereotyped diameter length of side and the summation of the arc length of side, just in time be the girth of semicircle, and the arc length of side are the semicircle circumference half.So in student's brains, stayed deep impression, run into the sight that this exercise will be remembered demonstration later on again, improve the accuracy of solving a problem.
Semicircle girth demonstration device is a rectangular flat that is provided with frame, erects a semicircle flat board below the left side of rectangular flat, and semicircle dull and stereotyped diameter line is leaned on mutually with the minor face in rectangular flat left side.Be provided with a mope pole at the semicircle dull and stereotyped back side, centre point position, the confession hand is caught and is moved on slide rail; Positive visible semicircle dull and stereotyped motion track place of mobile gained on rectangular flat, the center of circle of rolling at rectangular flat promptly establishes a slide rail, the straight-line segment of slide rail equates that with semicircle dull and stereotyped arc length the terminal of the segmental arc of slide rail just in time is that semicircle dull and stereotyped diameter line is pressed on the long limit of going to the bottom of rectangular flat.
Adopting the beneficial effect of semicircle girth demonstration device is to have stayed deep impression in student's brains, runs into the sight that this exercise will be remembered demonstration later on again, improves the accuracy of solving a problem.
Description of drawings
Fig. 1 is the structural representation of semicircle girth demonstration device.
Embodiment
With reference to Fig. 1, semicircle girth demonstration device is a rectangular flat 1 that is provided with frame, erects a semicircle flat board 2 below the left side of rectangular flat 1, and semicircle dull and stereotyped 2 diameter line is leaned on mutually with the minor face in rectangular flat 1 left side.Be provided with a mope pole 3 at semicircle dull and stereotyped 2 the back side, centre point position, the confession hand is caught and is moved on slide rail 4; A slide rail 4 is promptly established by semicircle dull and stereotyped 2 the motion track place of the center of circle on rectangular flat 1 of rolling in front at rectangular flat 1, and the straight-line segment 5 that semicircle dull and stereotyped 2 camber lines extrude on rectangular flat 1 is gone to the bottom long limit equates with semicircle dull and stereotyped 2 arc length, and the terminal of the segmental arc of slide rail 4 just in time is semicircle dull and stereotyped 2 diameter line to be pressed in form straight-line segment 6 on the long limit of going to the bottom of rectangular flat 1.
Claims (1)
1. semicircle girth demonstration device is to constitute by demonstration is dull and stereotyped, semicircle is dull and stereotyped, it is characterized in that a rectangular flat (1) that is provided with frame, one semicircle dull and stereotyped (2) are erect in below, left side at rectangular flat (1), and the diameter line of semicircle dull and stereotyped (2) is leaned on mutually with the minor face in rectangular flat (1) left side; The back side, centre point position in semicircle dull and stereotyped (2) is provided with a mope pole (3); Go up the motion track place that move by the center of circle of semicircle dull and stereotyped (2) of rolling at rectangular flat (1) in the front of rectangular flat (1) and promptly establish a slide rail (4), and the straight-line segment (5) that semicircle dull and stereotyped (2) camber line extrudes on rectangular flat (1) is gone to the bottom long limit equates with the arc length of semicircle dull and stereotyped (2), and the terminal of the segmental arc of slide rail (4) just in time is the diameter line of semicircle flat board (2) to be pressed on the long limit of going to the bottom of rectangular flat (1) form straight-line segment (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920047886XU CN201503650U (en) | 2009-08-21 | 2009-08-21 | Semicircle perimeter demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920047886XU CN201503650U (en) | 2009-08-21 | 2009-08-21 | Semicircle perimeter demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201503650U true CN201503650U (en) | 2010-06-09 |
Family
ID=42454580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920047886XU Expired - Fee Related CN201503650U (en) | 2009-08-21 | 2009-08-21 | Semicircle perimeter demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201503650U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781886A (en) * | 2016-12-15 | 2017-05-31 | 顾登慧 | Oval perimeters law verifies instructional device |
-
2009
- 2009-08-21 CN CN200920047886XU patent/CN201503650U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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: 20100609 Termination date: 20100821 |