CN2150598Y

CN2150598Y - Set square calculator

Info

Publication number: CN2150598Y
Application number: CN 93202121
Authority: CN
Inventors: 陈学
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-20
Filing date: 1993-01-20
Publication date: 1993-12-22
Anticipated expiration: 2003-01-20

Abstract

The utility model discloses a set square calculator which is a tool for teaching and learning. The set square calculator is divided into two types; one type is composed of a square and two isosceles right-angled triangles, and the other type is composed of a rectangle and two right-angled triangles. The right-angled triangle comprises an angle of 60 DEG and an angle of 30 DEG. An elastic rope is penetrated in a hole, the elastic rope is connected with the hole, and the set square calculator is formed. The set square can be rotated or folded, and plane geometry test questions with 61 kinds can be calculated by the set square calculator. The et square calculator has the advantages of simple manufacture, convenient use, variable change, easy understanding, and direct viewing. The set square calculator can be made into different sizes, such as big size, middle size, and small size. The set square calculator is widely applied to learning and teaching.

Description

Set square calculator

The utility model " set square exerciser " belongs to teaching and schooling apparatus, i.e. IC G09B23/04.

This set square exerciser can calculate examination questions such as the limit relevant with right-angle triangle, angle, line, figure, area.Known Chinese utility model patent CN90219104.7 number a kind of " triangle and trapezoidal demonstrating model " disclosed; In addition the CN90219053.9 patent disclosure a kind of " plane triangle and quadrilateral demonstrating model ", more than two kinds of models all be welded wire or connect with hinged joint and can overturn when drilling mould foldingly that but can not rotate, graphic change is limited.

The objective of the invention is in order to promote the reform in education, advocate happy teaching and improve student's learning interest, alleviate learning burden, design a kind of rotation ready to accept a higher or a lower post, the set square exerciser of front and back turnover.

The structure of the utility model set square exerciser is as depicted in figs. 1 and 2: set square exerciser a type as shown in Figure 1: formed by a rectangle (BDEF) and two right-angle triangles (ADE.EFC), wherein long limit and the minor face with right-angle triangle is equal respectively for the long limit of rectangle minor face, two other angle of right-angle triangle is respectively 30 degree angles and 60 degree angles, in rectangular diagonal angle and in the right angle of right-angle triangle, the equidistant place of distance two right-angle sides, make a call to an aperture, be formed by connecting by aperture with stretch cord or rubber band cover.

B type set square is drilled the mould device as shown in Figure 2: be to be that the isosceles right triangle (A ' D ' E ' and E ' F ' C ') of right-angle side is formed with a square (B ' D ' E ' F ') and two with the foursquare length of side, be formed by connecting with stretch cord or the perforation of rubber band cover.

This set square exerciser can be made large, medium and small different size with timber or plastics, as teaching aid and learning aid.

This set square is drilled the mould device and has been compared following advantage with existing triangle jigsaw, parallelogram demonstrating model:

1, simple in structure, easy to use, not only can fold, and can rotate, graphic change is various, can drill 61 kinds of plane geometry examination questions of mould;

2, connect promptly convenient practicality again with stretch cord or rubber band cover, can make jigsaw, can drill mould again, cultivate the student space and want, make student thought more active to power;

Description of drawings: Fig. 1 is an a type set square exerciser,

Fig. 2 is a b type set square exerciser,

Fig. 3 is that a type pattern develops the rectangle right-angled trapezium

The right-angle triangle parallelogram

Fig. 4 develops square right-angled trapezium for b type pattern

The isosceles right triangle parallelogram

Embodiment of the present utility model:

Make two kinds of a type set square exercisers of thick 1cm, wherein a with timber ₁Type rectangle minor face is 6cm, a ₂Type, minor face are 12cm, a ₁Type uses for the student, a ₂Make teaching mode.

B type set square exerciser, wherein b ₁Type is that the length of side is the square of 8cm, b ₂For the length of side is the square of 20cm.

This set square exerciser can be made large, medium and small different size, can use timber and plastic production, and the surface can the brushing different colours, and also available subsides self-adhesive paper is distinguished in identification.

Utilize this set square exerciser, can calculate 61 kinds of plane geometry examination questions, for example:

One, calculation limit or line

1, calculates the neutrality line at right angle, equal half of base, i.e. DE=1/2BC;

2, the center line of calculation right-angle triangle equals half of hypotenuse, i.e. BE=1/2AC;

3, calculation is in right-angle triangle, 30 ° of angles right limit equal half of hypotenuse; Be BC=1/2AC;

4, calculation right angled isosceles triangle two waists equate;

5, two groups of opposite side of calculation parallelogram equate;

Two, calculation angle

1, the relation at calculation round angle, the straight angle, right angle;

A, 1 straight angle=2 straight angle b, 1 round angle=2 straight angles=4 right angles;

2, calculation right-angle triangle interior angle and equal 180 °;

3, calculation complementary angle relation;

4, the calculation corresponding angle equate with alternate interior angle;

5, calculation row diagonal angle, parallel four limit equates;

Three, develop figure

1, Fig. 3-1 and Fig. 3 the-the 2nd, and Fig. 1 vertically with laterally develops;

Rectangle → right-angled trapezium → right-angle triangle → parallel four limit row;

2, Fig. 4 is the evolution process of Fig. 2

Square → right-angled trapezium → isosceles right triangle → parallel four limit row;

Four, calculation corner relation

1, two angles that the limit is formed

2, three angles that the limit is formed

3, the angle formed of four edges

4, five angles that the limit is formed

Five, calculation area:

1, the area of calculation right-angle triangle;

2, the area of calculation right-angled trapezium;

3, the area of the parallel four limit row of calculation;

Concrete calculation method: S parallelogram=end * height

Fig. 3 is drawn back into parallel four limit row, and rectangle EBFC both sides respectively connect the triangle that an area equates, two triangles are involutory, develop into a rectangle again, and to take advantage of height be S parallelogram=end * height so the area of parallelogram equals the end.

Claims

1, set square exerciser, be by triangle, rectangle and square are formed, it is characterized in that being formed by a rectangle (or square) and two right-angle triangles, four apertures are made a call at the equidistant place of distance two right-angle sides respectively in the diagonal angle of rectangle (or square) and in the right angle of two right-angle triangles, are formed by connecting by aperture with stretch cord or rubber band cover.

2, by the described set square exerciser of claim 1, it is characterized in that this set square exerciser has two kinds of forms of A, B: the right-angle triangle that the A type is 30 ° of angles and 60 ° of angles by rectangle and two acute angles is formed; Type B is made up of square and two isosceles right triangles.

3,, it is characterized in that this exerciser can use timber and plastic production by the described set square exerciser of claim 1.