CN201126650Y - Teaching appliances for demonstrating sharp angle trigonometric function - Google Patents
Teaching appliances for demonstrating sharp angle trigonometric function Download PDFInfo
- Publication number
- CN201126650Y CN201126650Y CNU2007200166074U CN200720016607U CN201126650Y CN 201126650 Y CN201126650 Y CN 201126650Y CN U2007200166074 U CNU2007200166074 U CN U2007200166074U CN 200720016607 U CN200720016607 U CN 200720016607U CN 201126650 Y CN201126650 Y CN 201126650Y
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- China
- Prior art keywords
- hypotenuse
- angle side
- base
- teaching aid
- acute angle
- 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
A teaching aid for demonstration of acute angle trigonometric functions is disclosed, characterized in that the teaching aid is provided with a rectangular base which is provided with a rotatable bevel side, one end point of the bevel side is hinged with the end point of a fixing right-angled side at left lower corner on the surface of the base, another end point of the bevel side is intersected with a movable right-angled side whose two ends are provided in two slide ways at upper part and lower part of the surface of the base and move down the slide ways; left lower corner on the surface of the base is also provided with an arc-shaped protractor dial which is intersected with the rotatable bevel side; the rotatable bevel side, the fixing right-angled side and the movable right-angled side are all provided with scale lines. With simple structure and strong operability, the utility model can demonstrate basic concepts of the acute angle trigonometric functions, which not only facilitates teacher to complete teaching mission fast and conveniently, but improves practical ability and study interest of the students, consequentially, the utility model offers large help to the students in cultivating the abilities about problem analysis and solving.
Description
Technical field
The utility model relates to a kind of teaching aid, particularly relates to a kind of teaching aid that is exclusively used in demonstration acute angle trigonometric function, is to having replenishing of middle-school mathematics teaching apparatus kind now, belonging to the school supply and stationery category.
Background technology
At present, middle and primary schools' teaching aid kind is a lot, but function singlenesses all just designs at the content that needs separately to show.At stage in junior middle school acute angle trigonometric function and relevant knowledge is very important content in the mathematical education, yet be again one of the important of mathematics class and the course of beyonding one's depth, student and teacher press for teaching aid targetedly, existing teaching is not because of there being teaching aid, the student can only remember by force with teacher's oral account, more abstract, the student is difficult to understand, let alone allow the undergo proof procedure of acute angle trigonometric function and relevant knowledge of student, thereby bring certain difficulty to teaching, even have influence on student performance and learning interest.
The utility model content
The purpose of this utility model is to overcome the prior art above shortcomings, improves by research, provides a kind of teaching aid of demonstrating the acute angle trigonometric function.This novel teaching aid is simple in structure, workable, can demonstrate the key concept of acute angle trigonometric function and relevant knowledge, both be convenient to the teacher and finished teaching task quickly, improved the interest and the manipulative ability of student's study again, very helpful to the analysis and the problem-solving ability of cultivating the student.
The technical scheme that the utility model provides is: the teaching aid of this demonstration acute angle trigonometric function, be characterized in a rectangular base, susceptor surface is provided with rotating hypotenuse, end points of this hypotenuse and one the fixedly end points of right-angle side are articulated in the lower left corner of susceptor surface, another end points of this hypotenuse and one movably right-angle side are intersected, this movably is located in two slideways of susceptor surface upper and lower and according to the slideway move left and right at the two ends of right-angle side, all with fixedly right-angle side is parallel for two slideways, the lower right-hand corner of susceptor surface also is provided with the protractor index dial of an arc, the protractor index dial of rotating hypotenuse and arc intersects, rotating hypotenuse, fixing right-angle side and movably be equipped with scale mark on the right-angle side, susceptor surface is provided with counter and handle.
Compared with prior art, the beneficial effects of the utility model are: simple in structure, workable, can demonstrate the key concept of acute angle trigonometric function and relevant knowledge, both be convenient to the teacher and finished teaching task quickly, improved the interest and the manipulative ability of student's study again, very helpful to the analysis and the problem-solving ability of cultivating the student.
Description of drawings
Accompanying drawing is the structural representation that the utility model provides embodiment.
Embodiment
As shown in the figure, the teaching aid of this demonstration acute angle trigonometric function, a rectangular base 9 is arranged, base 9 surfaces are provided with rotating hypotenuse 6, end points of this hypotenuse 6 and one the fixedly end points of right-angle side 10 are articulated in the lower left corner on base 9 surfaces by bolt 4, another end points of this hypotenuse 6 and one movably right-angle side 5 are intersected, this movably is located in two slideways 11 and 12 of base 9 upper surfaces and bottom in the two ends of right-angle side 5 by bolt 2 and 3, and according to slideway 11 and 12 move left and right, all with fixedly right-angle side 10 is parallel with 12 for two slideways 11, the lower right-hand corner on base 9 surfaces also is provided with the protractor index dial 7 of an arc, rotating hypotenuse 6 intersects with the protractor index dial 7 of arc, rotating hypotenuse 6, fixedly right-angle side 10 and movably be equipped with scale mark on the right-angle side 5 also is provided with counter 1 and handle 8 on base 9 surfaces.
During demonstration, when rotating hypotenuse 6 turns to certain position, after movably right-angle side 5 also moves to certain position, can read angle by the protractor index dial 7 of arc, read the length of this angle equal edge, adjacent side and hypotenuse by rule, calculate the ratio of opposite side and hypotenuse with counter 1, and the ratio of adjacent side and hypotenuse; Move movably right-angle side 5 again, this moment, the length of opposite side, adjacent side and hypotenuse of original acute angle all changed, and calculated the ratio of opposite side and hypotenuse with counter 1, and the ratio of adjacent side and hypotenuse, compare with the data of calculating first, find that corresponding ratio does not change; Rotate rotating hypotenuse 6, angle is changed, continue same operation, also can lead to the same conclusion.
Claims (1)
1. teaching aid of demonstrating the acute angle trigonometric function, it is characterized in that having a rectangular base, susceptor surface is provided with rotating hypotenuse, end points of this hypotenuse and one the fixedly end points of right-angle side are articulated in the lower left corner of susceptor surface, another end points of this hypotenuse and one movably right-angle side are intersected, this movably is located in two slideways of susceptor surface upper and lower and according to the slideway move left and right at the two ends of right-angle side, all with fixedly right-angle side is parallel for two slideways, the lower right-hand corner of susceptor surface also is provided with the protractor index dial of an arc, the protractor index dial of rotating hypotenuse and arc intersects, rotating hypotenuse, fixing right-angle side and movably be equipped with scale mark on the right-angle side, susceptor surface is provided with counter and handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200166074U CN201126650Y (en) | 2007-12-10 | 2007-12-10 | Teaching appliances for demonstrating sharp angle trigonometric function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200166074U CN201126650Y (en) | 2007-12-10 | 2007-12-10 | Teaching appliances for demonstrating sharp angle trigonometric function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201126650Y true CN201126650Y (en) | 2008-10-01 |
Family
ID=40000117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200166074U Expired - Fee Related CN201126650Y (en) | 2007-12-10 | 2007-12-10 | Teaching appliances for demonstrating sharp angle trigonometric function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201126650Y (en) |
-
2007
- 2007-12-10 CN CNU2007200166074U patent/CN201126650Y/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 |