CN202720802U

CN202720802U - Middle school mathematics trigonometry teaching aid

Info

Publication number: CN202720802U
Application number: CN 201220432303
Authority: CN
Inventors: 陈家齐
Original assignee: 陈家齐
Priority date: 2012-08-22
Filing date: 2012-08-22
Publication date: 2013-02-06
Anticipated expiration: 2022-08-22

Abstract

The utility model discloses a middle school mathematics trigonometry teaching aid. The teaching aid comprises a main scale, scale marks arranged along a length direction of the main scale, a rotating shaft arranged on two ends of the scale marks of the main scale, and two ends of the main scale are respectively connected with a subsidiary scale. Each subsidiary scale is arranged with scale marks with the rotating shaft connected with a scale body as a zero point. Through changing position relations of the main scale and the subsidiary scales, the teaching aid can demonstrate randomly and intuitively different triangular patterns in different shapes to students, and also randomly and intuitively makes students observe proportional relations of edges and angles of various shaped triangles.

Description

Student mathematics triangle teaching teaching aid

Technical field

The utility model relates to teaching aid, is directly involved in the student mathematics teaching aid.

Background technology

The teaching of middle school mathematics class, the especially teaching of triangle class usually will be used the teaching aids such as ruler, set square.Yet these teaching aids are difficult at random, demonstrate difform leg-of-mutton form to the student intuitively, thereby also are difficult to allow at random, intuitively observation of students arrive leg-of-mutton limit, the angle proportionate relationship of various shapes.

The utility model content

The purpose of this utility model just provides a kind of improved student mathematics teaching aid, and it can effectively solve existing teaching aid and be difficult to demonstrate difform leg-of-mutton form, be difficult to allow intuitively at random observation of students arrive the problem of the leg-of-mutton corner proportionate relationship of various shapes to the student intuitively at random.

The purpose of this utility model is achieved in that student mathematics triangle teaching teaching aid, has main scale, along the main scale length direction scale mark is set, at described main scale scale mark two ends rotating shaft is set, the main scale two ends connect a secondary chi separately by rotating shaft, and the rotating shaft that every secondary chi all connects take blade separately arranges scale mark as starting point.

The utility model is owing to be provided with rotating shaft, main scale two ends and connect separately rotating shaft that a secondary chi, every secondary chi all connect take blade separately by rotating shaft and be provided with scale mark as starting point at main scale scale mark two ends, thereby the position relationship by conversion main scale, secondary chi, can be at random, demonstrate difform leg-of-mutton form to the student intuitively, also can allow at random, intuitively observation of students arrive leg-of-mutton limit, the angle proportionate relationship of various shapes.

Description of drawings

Accompanying drawing 1 is structure principle chart of the present utility model, and the utility model is described in further detail below in conjunction with accompanying drawing.

Embodiment

Accompanying drawing shows the structure of the utility model student mathematics triangle teaching teaching aid, has main scale 2, along main scale 2 length directions scale mark is set, at described main scale 2 scale mark two ends rotating shaft 3 is set, main scale 2 two ends connect a secondary chi 1 separately by rotating shaft 3, and the rotating shaft 3 that every secondary chi 1 all connects take blade separately arranges scale mark as starting point.

When known two angles of triangle, the utility model can be demonstrated out leg-of-mutton shape at once, and presents the proportionate relationship at each limit of triangle, angle; When the ratio on known three limits of triangle, the utility model also can be demonstrated out leg-of-mutton shape at once, and presents the proportionate relationship at each limit of triangle, angle; When the ratio on known two limits of triangle and angle thereof, the utility model can also be demonstrated out leg-of-mutton shape at once, and presents the proportionate relationship at each limit of triangle, angle.

In the utility model, main scale 2 can also use as conventional ruler; Main scale 2 cooperates and can draw angle at blackboard with a secondary chi 1; Main scale 2 cooperates and can draw parallel lines at blackboard with two secondary chis 1; Main scale 2 cooperates with two secondary chis 1 and can draw difform triangle at blackboard.

In the utility model, main scale 2 and secondary chi 1 preferentially select transparent material to make.

Claims

1. student mathematics triangle teaching teaching aid, has main scale (2), along main scale (2) length direction scale mark is set, it is characterized in that: at described main scale (2) scale mark two ends rotating shaft (3) is set, main scale (2) two ends connect a secondary chi (1) separately by rotating shaft (3), and the rotating shaft (3) that every secondary chi (1) all connects take blade separately arranges scale mark as starting point.