CN2148372Y - Circle area calculating demonstration apparatus - Google Patents
Circle area calculating demonstration apparatus Download PDFInfo
- Publication number
- CN2148372Y CN2148372Y CN 92209849 CN92209849U CN2148372Y CN 2148372 Y CN2148372 Y CN 2148372Y CN 92209849 CN92209849 CN 92209849 CN 92209849 U CN92209849 U CN 92209849U CN 2148372 Y CN2148372 Y CN 2148372Y
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- CN
- China
- Prior art keywords
- demonstration
- area
- demonstrator
- piece
- demonstration board
- 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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Abstract
The utility model relates to a circle area calculating demonstration apparatus. The utility model is composed of a demonstration block and a demonstration plate which are provided with magnetic devices. The utility model is convenient for a teacher to teach children the derivation of the formula pi R<2> for computing the circle area, and is suitable for use in teaching mathematics in primary schools.
Description
The utility model belongs to the teaching demonstration instrument.
Children education GPRS children's psychology, general some teaching appliances intuitively that adopt during for mathematical education can the abstract mathematical operation of association from demonstration intuitively so as to helping children.As in the primary school teaching to garden area computing formula π R
2How to get? be difficult to for the moment make clear, found a kind of mode afterwards, be combined into a rectangle after exactly a garden area being cut into many, π R to children
2Become R * R * π.Therefrom can see: the children that wide ≈ R, long ≈ R * π understand multiplication so just are appreciated that the formula of garden area.The teaching aid that adopts during teaching generally is to cut with materials such as plank, cardboards, but to often change and to take up and down easily during owing to explanation, and when saying that time service will stand in teaching aid the student who makes the back on the blackboard and can both see for a plurality of students, cutting cube cannot be fixed, and says that to the teacher time service has increased many troubles.
The purpose of this utility model is: a kind of convenience garden area calculating intuitively demonstrator is provided.
Technical essential of the present utility model be on the demonstration board and demonstration to be fixed with on the piece fixing on the magnetic device demonstration board respectively be an annular magnetic device and two rectangle magnetic devices.Garden area demonstration piece internal fixation two magnetic devices are fixed with the method that magnetic is attached, and just it can stand on demonstrator on the blackboard and lecture to child.
Accompanying drawing 1 is that the garden area calculates the demonstrator synoptic diagram
Accompanying drawing 2 is that the garden area calculates demonstrator synoptic diagram A-A cut-open view
Accompanying drawing 3 is that the garden area calculates demonstrator synoptic diagram B-B cut-open view
［ 1 ］ is demonstration board among the figure, and an annular magnetic device ［ 2 ］ is fixed at the back side of demonstration board, and the annular magnetic device is fixed with bonding agent in the sleeve pipe ［ 3 ］ at the demonstration board back side.［ 4 ］ be two rectangle magnetic devices, this device is fixed in two rectangular recess ［ 5 ］ at demonstration board back, also available bonding agent is fixed, to note pole orientation in the time of fixedly, ［ 6 ］ be a garden area to be cut into some demonstration piece, inner bottom is fixed with two rectangle magnetic patch ［ 7 ］, with the absorption affinity of increase with demonstration board.Wherein there is a demonstration piece to be divided into two,, makes it more be approximately rectangle so that demonstration is supplied both sides during rectangle.In order to increase absorption affinity and conveniently to demonstrate piece and take down demonstration from demonstration board, between demonstration piece and the demonstration board garden sheet metal ［ 8 ］ is arranged, its area equates with the total area of demonstration piece.Demonstration board ［ 1 ］ and demonstration piece should adopt its nonmetallic materials to make.
The magnetic device of this demonstrator inside is situation as required, adopts calutron or permanent magnetic device respectively.
The utility model can be taken down the demonstration piece from demonstration board easily, and when demonstrator stands on blackboard, because the attached mode of magnetic can not slide the demonstration piece from demonstration board, has made things convenient for teaching and student's intuitivism apprehension.
Claims (6)
1, a kind of garden area calculating demonstrator is made up of demonstration board [1] and demonstration piece [6], it is characterized in that being fixed with magnetic device respectively on demonstration board [1] and the demonstration piece [6].
2, calculate demonstrator by the described garden of claim 1 area, magnetic device is an annular magnetic device ［ 2 ］ and two rectangle magnetic devices ［ 4 ］ to it is characterized in that going up fixedly by demonstration board ［ 1 ］.
3, calculate demonstrator by the described garden of claim 1 area, it is characterized in that demonstrating being fixed with two rectangle magnetic devices ［ 7 ］ on the piece ［ 6 ］.
4, calculate demonstrator by the described garden of claim 1 area, it is characterized in that described annular magnetic device ［ 2 ］ usefulness adhesive is in the sleeve pipe ［ 3 ］ at demonstration board back.
5, calculate demonstrator by the described garden of claim 1 area, it is characterized in that described rectangle magnetic device ［ 4 ］ is fixed in the rectangular recess ［ 5 ］ at demonstration board ［ 1 ］ back.
6, calculate demonstrator by the described garden of claim 1 area, it is characterized in that having its area of a sheet metal ［ 8 ］ to equate between described demonstration board ［ 1 ］ and the demonstration piece ［ 6 ］ with the total area of demonstrating piece ［ 6 ］.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92209849 CN2148372Y (en) | 1992-05-13 | 1992-05-13 | Circle area calculating demonstration apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92209849 CN2148372Y (en) | 1992-05-13 | 1992-05-13 | Circle area calculating demonstration apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2148372Y true CN2148372Y (en) | 1993-12-01 |
Family
ID=33762874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92209849 Expired - Fee Related CN2148372Y (en) | 1992-05-13 | 1992-05-13 | Circle area calculating demonstration apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2148372Y (en) |
-
1992
- 1992-05-13 CN CN 92209849 patent/CN2148372Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |