CN2802584Y

CN2802584Y - Pythagoream theorem counting rule

Info

Publication number: CN2802584Y
Application number: CN 200420069631
Authority: CN
Inventors: 吴会明; 吴双
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-30
Filing date: 2004-06-30
Publication date: 2006-08-02
Anticipated expiration: 2014-06-30

Abstract

The utility model discloses a Pythagorean theorem counting rule used for the mathematics teaching of high school. Aiming at the problem in the prior art, the Pythagorean theorem counting rule has the technical scheme that the rectangle Pythagorean theorem counting rule of the counting rule type is adopted; the graduations on the Pythagorean upper rule and the Pythagorean lower rule of the Pythagorean theorem counting rule are same, namely that the 1mm graduation on the upper Pythagorean theorem counting rule and the lower Pythagorean theorem counting rule is labeled with 1 which represents 1 <2>; the 4mm graduation is labeled with 2 which represents 2 <2>....... The middle of the transverse section of the Pythagorean lower rule is provided with a rule slot; the surface of the upper end of the rule is engraved with the graduations of 0 to 14cm......, which is a ruler. The Pythagorean theorem counting rule solves the problem of abstract and unfathomed process in the prior art that the sum of square of two right angle sides of a right triangle is known and the square of the third right angle side needs to be counted. The utility model is applied to the mathematics teaching in high school extensively.

Description

Collude a strand slipstick

Technical field:

The utility model relates to strand slipstick that colludes that a kind of middle-school mathematics teaching uses.

Background technology:

Use Pythagorean theorem in the present domestic middle school teaching always, asking the method for square promptly calculating the 3rd limit square on the 3rd limit in two right-angle side quadratic sums of known right-angle triangle.Though this method is accurately easily gone, very abstract, the student can only accept to be not easy to improve student's understandability and results of learning stiffly.

The utility model content:

In order to overcome deficiency of the prior art, the utility model provides a kind of strand slipstick that colludes, and the number that utilizes this chi just can calculate the 3rd limit in the right-angle triangle very easily promptly colludes number of share of stock.

The technical scheme that the utility model technical solution problem is adopted is: according to Pythagorean theorem: in right-angle triangle two right-angle sides square and what equal hypotenuse square is a ²+ b ²=c ², the inventor succeeds in developing through teaching practice experiment with computing for many years and colludes a strand slipstick, this chi be with collude a strand last chi insert and collude strand chi groove that following chi links to each other in and constitute, and be carved with the scale of 0～14cm at the upper end face of this chi, can do ruler amount length usefulness.What the scale on colluding strand last chi and colluding strand following chi was that the identical 1mm scale that promptly colludes on the chi strand up and down is marked with 1 expression is 1 ²Be marked with 2 at the 4mm scale, expression be 2 ²Be marked with 3 at the 9mm scale, expression be 3 ²Be marked with 4 at the 16mm scale, expression be 4 ²Illustrate in view of the above collude mark on

strand slipstick

1,2,3,4 ..., actual is 1 ², 2 ², 3 ², 4 ², during use number such as a=3, the b=4 that asks hypotenuse with the number of known two right-angle sides, ask hypotenuse c, at first 0 scale that colludes chi on the thigh with collude thigh under 3 on the chi align, collude find on the chi on the

thigh

4,4 with collude thigh under 5 corresponding on the chi, then 5 is the hypotenuse c that asked.If known hypotenuse 13 and a right-angle side 5 are asked another right-angle side, also be 0 scale that will collude strand last chi and 5 aliging of colluding strand following chi, chi 13 scales pairing 12 are right angle length of sides of being asked under the thigh colluding then.

The utility model beneficial effect is: this chi is simple in structure, and the limit of calculating right-angle triangle is convenient, speed is fast, gives the student to calculate the number of share of stock that colludes on the unknown limit of right-angle triangle intuitively, is convenient to teaching, enhancing student's perceptual knowledge.

Description of drawings:

Fig. 1 is the utility model one-piece construction synoptic diagram.

Among the figure 1, collude a strand last chi, 2, the chi groove, 3, collude a strand following chi, 4, ruler.

Embodiment:

Consult Fig. 1, make the rectangle of slipstick formula with organic glass and collude a strand slipstick, this chi is provided with and colludes strand last chi 1 and collude a strand following chi 3, and is carving the scale that colludes number of share of stock by the number of share of stock that colludes that calculates on the chi face on this chi; Scale on colluding strand following chi 3 and colluding strand last chi 1 is identical, and the 1mm scale that promptly colludes strand on the chi up and down is marked with 1, expression be 1 ²Be marked with 2 at the 4mm scale, expression be 2 ², in the middle of colluding under the thigh chi transversal section, be provided with chi groove 2, and be carved with 0～14cm at this chi upper end face ... scale as ruler 4.

Claims

1, a kind of strand slipstick that colludes, it is characterized in that: the rectangle of making the slipstick formula with organic glass is colluded a strand slipstick, this chi is provided with and colludes strand last chi (1) and collude a strand following chi (3), is colluding the middle chi groove (2) that is provided with in chi transversal section under the thigh, and is being provided with ruler (4) in this chi upper end.