CN202242589U

CN202242589U - Triangular ruler with special angles

Info

Publication number: CN202242589U
Application number: CN2011203665278U
Authority: CN
Inventors: 杨饔; 牛新华; 王锐; 田功名
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-29
Filing date: 2011-09-29
Publication date: 2012-05-30
Anticipated expiration: 2021-09-29

Abstract

The utility model discloses a triangular ruler with special angles. A 45-degree isosceles right-angled triangular ruler and a 30-degree and 60-degree right-angled triangular ruler are respectively drawn with a straight line (1) vertical to the graduated edge of the triangular ruler, and the length of the straight line is less than or equal to 2.5cm; secondly, the 45-degree isosceles right-angled triangular ruler is drawn with a straight line (2) parallel to an inclined edge; and then the 30-degree and 60-degree right-angled triangular ruler is drawn with a straight line (3) parallel to the inclined edge. In the triangular ruler, graphics with special angles such as 90 degrees, 30 degrees, 150 degrees, 60 degrees, 120 degrees, 45 degrees and 135 degrees are conveniently made by teachers and students by utilizing the triangular ruler, so that the time for moving the triangular ruler by the teachers and students is reduced in making the graphics, and the speed and the quality in making the graphics are improved.

Description

The set square of band special angle

Technical field

The utility model relates to schooling apparatus and teaching aid, specifically is a kind of set square with angle.

Background technology

Primary and secondary students are in the process of mapping; Use existing set square to cross the vertical line of the known straight line of known strokes and dots; Or when doing the special angle of 90 °, 30 °, 150 °, 60 °, 120 °, 45 °, 135 °; Set square will move more than once, and this has brought inconvenience for primary and secondary students and teacher's mapping.

Summary of the invention

In order to overcome the existing set square awkward deficiency of mapping, the utility model purpose is that existing set square has been done further improvement, and a kind of set square with special angle is provided.

The utility model purpose is achieved in that

Perpendicular to the straight line on the graduated limit of set square 1. a kind of set square with special angle respectively draws one respectively, its length≤2.5cm on 45 ° of isosceles drawing squares and 30 °, 60 ° drawing squares; Secondly, on 45 ° of isosceles drawing squares 1, draw a straight line parallel 2. with hypotenuse; Then, on 30 °, 60 ° drawing squares 2, draw a straight line parallel 3. with hypotenuse.

The advantage of the utility model:

The utility model is on existing 45 ° of isosceles drawing squares and 30 °, 60 ° drawing squares; Three straight lines are set; Utilize these three straight lines to be convenient to the figure that teachers and students can do 90 °, 30 °, 150 °, 60 °, 120 °, 45 °, 135 ° special angles; Reduce teachers and students move set square when mapping number of times, improved mapping speed and quality.

Description of drawings

Fig. 1 is 45 ° of isosceles drawing square sketch mapes.

Fig. 2 is 30 °, 60 ° drawing square sketch mapes.

The specific embodiment

The utility model is described further with Fig. 2 in conjunction with accompanying drawing 1:

Shown in Fig. 1-2, a kind of set square with special angle promptly adopts existing 45 ° of isosceles drawing squares and 30 °, 60 ° drawing squares.On 45 ° of isosceles drawing squares 1 and 30 °, 60 ° drawing squares 2, respectively draw one respectively 1., its length=2.5cm (as shown in Figure 1) perpendicular to the straight line on the graduated limit of set square; Secondly, on 45 ° of isosceles drawing squares 1, draw a straight line parallel 2. (as shown in Figure 1) with hypotenuse; Then, on 30 °, 60 ° drawing squares 2, draw a straight line parallel 3. (as shown in Figure 2) with hypotenuse.

Label is convenient to the vertical line of the known straight line of picture and 90 ° angle for straight line 1.; Label is convenient to 45 ° in picture, 135 ° angle for 2. straight line; Label is convenient to 30 ° in picture, 150 °, 60 °, 120 ° angle for 3. straight line.

During mapping:

When 1, crossing the vertical line of the known straight line of known strokes and dots; Let the label be that 1. line overlaps with known straight line, and mobile set square, let graduated limit cross known point; The drawn straight line along the graduated limit of set square is just crossed known point and the straight line vertical with known straight line then.

2, use label for 1., 2., when line is 3. done 90 °, 45 °, 135 °, 30 °, 150 °, 60 °, 120 ° angle respectively, all let them overlap, the required angle of can drawing successively with known straight line.

Claims

1. perpendicular to the straight line on the graduated limit of set square 1. set square with special angle is characterized in that on 45 ° of isosceles drawing squares 1 and 30 °, 60 ° drawing squares 2, respectively drawing respectively one, its length≤2.5cm; Secondly, on 45 ° of isosceles drawing squares 1, draw a straight line parallel 2. with hypotenuse; Then, on 30 °, 60 ° drawing squares 2, draw a straight line parallel 3. with hypotenuse.