How to use the triangle ruler correctly, what is the use of the triangle ruler?

1. If you use a scale, you must first choose the scale you need. Different scale indexing values and measuring ranges are different, and the graduation values are meters, centimeters, and millimeters. and other units.

The choice of a specific scale is based on the object you are measuring, so you must first choose the right scale in order to use it correctly.

2. When measuring, it is necessary to pay attention to the position of the scale to be placed correctly, some scales are thicker, the scale should be close to the object, and there are also cases of scale line wear, at this time, a certain scale line should be used as the zero point. When reading, pay attention to subtracting the number before the "zero point".

3. The most critical step is to read, and pay attention to the line of sight facing the scale and perpendicular to the ruler when reading.

4. It is also important to note that the number of the graduation value on the scale is to distinguish the number of the graduation value, and at the same time to estimate and read the next digit of the graduation value. When aligning scale values, estimate 0.

5. I would like to introduce you to the classification of scales: rulers, triangular rulers, and tape measures, which are usually used in daily life and production. Huayou is a precision measuring tool: vernier calipers, spiral micrometers, usually used in machining for precision measurements.

6. The mathematical tools commonly used by primary and secondary school students are: ruler, compass, triangular ruler, curve board, protractor, computer, eraser, pencil.

What it does:

1. Use a triangular ruler to easily draw an integer multiple of 15°. In particular, a triangular ruler and a T-ruler can be combined to draw a series of vertical lines in a bottom-up order. Matching a T-ruler with a triangular ruler allows you to draw an angle of °.

Diagonal lines are usually drawn from left to right when drawing. You can also draw a diagonal line of ° with two triangular rulers in conjunction with a T-ruler.

2. With the cooperation of two triangular rulers, you can draw the parallel lines of any drawing line.

3. Two triangular rulers can be pieced together to draw angles of 135°, 120°, 150°, 75° and 105°.

Features: — 1 right angle and 2 acute angles on the block triangular ruler.

Both acute angles of the isosceles right-angle triangular ruler are 45°. Two identical isosceles right triangles can be put together into a square, or they can be put together into a larger isosceles right triangle. The two right-angled sides of an isosceles right-angled triangular ruler are equal in length.

The acute angles of the slender triangular rulers are 30° and 60°, respectively. Two identical slender triangular rulers can be put together to form a regular triangle. The length of the hypotenuse of a slender triangle is twice the length of the short right-angled edge.

You can measure the length, draw right angles, draw straight lines, etc., ......

You can quickly draw 30 degrees, 45 degrees, and 90 degrees angles.

The triangle plate has isosceles right angles, that is, 45, 45, 90. And 30 60 90. The use of a triangle plate makes it easy to draw an angle of an integer multiple of 15°.

In particular, a triangle board and a T-shaped ruler can be combined to draw a series of vertical lines in a bottom-up order. Matching a T-ruler with a triangle plate allows you to draw an angle of °. Diagonal lines are usually drawn from left to right when drawing.

With two triangles and a T-ruler, you can also draw a diagonal line of °.

With the combination of two triangles, you can draw parallel lines of any one of the drawing lines.

Two triangles can be pieced together to create angles of 135°, 120°, 150°, 75°, and 105°.

Both.

The triangular ruler has three corners and three sides, and each triangular ruler is composed of two special right-angled triangles. One is an isosceles right-angled triangular ruler, and the other is a right-angled triangular ruler with special angles (hereinafter referred to as a slender triangular ruler).

The multi-functional triangular ruler is a circle drawing mechanism that is composed of a rotating ring and a turntable at the two acute angles of the original triangular ruler, a pendulum needle-shaped angle drawing mechanism is installed at the protractor, a frame is installed at the bottom edge, a groove rail is provided in the frame, and a parallel line drawing mechanism composed of a positioning mechanism composed of a schedule plate, an elastic material and a slider embedded in the groove is installed in the groove to facilitate sliding.

It maintains the function of the original triangular ruler, adds the function of drawing parallel lines, small circles and can draw angles, and is compact and easy to use.

There are 6 types of triangular rulers, which are °. A triangular ruler has two triangular plates, which are right-angled triangles formed by °.

and ° to form a right triangle.

Splice two triangles at different anglesThe two acute angles in the right triangle formed by ° in the triangular ruler are both 45°, so the question becomes how many angles can be put together by the combination of ° and °. After splicing in pairs, you can get six angles.

Take a triangular ruler to draw an angle of 15 degrees as an example, and draw it as follows:

1. Prepare a blank piece of paper, pencil, eraser, and a thin triangular ruler and an isosceles triangular ruler.

2. On the top of the white paper, draw a 60-degree angle along the edge with a thin triangle ruler of 60 degrees.

3. After drawing, use the 45-degree angle of the isosceles triangle ruler, align the vertex of the top and bottom points with the 60-degree angle, and align one of the sides to draw a 45-degree angle.

4. Erase off the auxiliary edges and complete the 15-degree angle drawing.

5. Use a measuring ruler to verify the angle of 15 degrees we draw.

The key is how many degrees of angle you draw, and there are different specifications of triangular rulers, and the commonly used ones are 45, 45, and 90 degrees.

You can draw the angles in the diagram individually, or you can draw °

Ruler diagram, with ABC congruent a1b1c1, step:

1. Make a straight line L, take any point A1, measure the length of the compass AB, take any direction on both sides of A1, and intercept A1B1=AB.

2. Compass measure the length of AC and BC, respectively, with A1 as the center of the circle AB length as the radius of the circle, and B1 as the center of the circle and the length of BC as the radius as the circle, you can get two intersection points, and choose any one as C1.

3. Connect a1c1 and b1c1 to get the congruent triangle a1b1c1 of abc

Suppose you want to make a triangle with three sides of x, y, z

First draw a line segment of long x in the plane, draw an arc with one of the endpoints as the center of the circle, y as the radius, and then draw an arc with another endpoint as the center of the circle and z as the radius, and the intersection of the two arcs is the third vertex of the triangle, and then connect them to be the triangle you are looking for!

It is easy to divide the circle into six equal parts with the radius of the circle, and then select the three equal points to connect them in turn, which is the inscribed regular triangle.

What kind of triangle to make? Right-angled triangle? Equilateral triangle? ......