Use a ruler to draw corners. Gives the vertex or vertices and one of their edges

Use a ruler to draw corners. Given the vertex or vertex and one of the edges, if there is no specified angle size, you can draw a ray over the vertex first, and then draw a ray through this vertex, and the angle between these two rays is the angle that needs to be drawn.

Suppose you are given a vertex and an edge, draw a 60-degree angle, and draw a ruler.

The steps are as follows: Step 1, draw a circle with radius r through this vertex a, and the given edge intersects the circle with point b, as shown in the following figure:

Step 2: Draw an arc with point B as the center and R as the radius, and intersect points A and C, as shown in the following figure

Step 3: Connect AC, BAC is a 60-degree angle, as shown in the following figure

From one point on. Use a ruler to draw two straight lines in different directions to draw an angle. In mathematical geometry, an angle consists of two edges and a vertex, where the vertex is the two edges have a common endpoint, and the angle is the same as the angle obtained by subtracting a circle.

For example, 45° and 360° 45° (=315°) are equivalent, but this only applies when the relative position is represented by angles, not the concept of rotation. Rotation 45° and rotation 315° are different.

In 3D geometry, there is no absolute definition of clockwise and counterclockwise, so when defining positive and negative angles, it is necessary to list the reference datums, generally based on a vertex passing through the angle and a vector perpendicular to the plane where the angle is located.

When navigating, the guidance is based on the north, and the forward direction is clockwise, so the guidance 45° corresponds to the northeast. There is no negative value for the guide, and the corresponding guide to the northwest is 315°.

First of all, take the vertex of the angle as the center of the circle, and the appropriate length is the radius Draw a circle Intersect the edges of the two corners at a, b and then take a and b as the center of the circle Draw a circle with the same radius Intersection at the point d Connect the vertices of the angle and d is the bisector of the angle According to the congruence (ss) of the triangle (d=db distance from a to the vertex = b to the vertex distance d to the vertex is the common edge).

The way to draw an angle is to draw the vertex first, and then from that point on, draw two rays in different directions with a ruler, and you will draw a corner.

Angles in geometry.

A geometric object consisting of two rays with a common endpoint. These two rays are called the edges of the corner, and their common endpoints are called the vertices of the corner.

1. Angles have a wide range of applications in geometry and trigonometry. Euclid, the father of geometry.

An angle has been defined as the relative slope of two non-parallel lines in a plane. Procruz thought that an angle might be a trait, a quantifiable quantity, or a relation.

2. The size of the angle has nothing to do with the length of the edge; The size of the angle is determined by how far apart the two sides of the horn are, the larger the opening, the larger the angle, and conversely, the smaller the opening, the smaller the angle. In the dynamic definition, it depends on the direction and angle of rotation.

3. Angles can be divided into acute angles, right angles, and obtuse angles.

Flat angles, circumferential angles, etc. Angles greater than 0 degrees and less than 90 degrees are called acute angles; An angle equal to 90 degrees is called a right angle; Angles greater than 90 degrees and less than 180 degrees are called obtuse angles; An angle equal to 180 degrees is a flat angle, and an angle equal to 360 degrees is a circumferential angle.

According to the concept of angles, it can be seen that from a vertex, draw two lines in different directions with a ruler, and it becomes an angle, which is correct;

So the answer is: true

According to the concept of angles, it can be seen that from a vertex, draw two lines in different directions with a ruler, and it becomes an angle, which is correct;

So the answer is: true

Static Definition of Angle A graph consisting of two rays with a common endpoint is called an angle. This common endpoint is called the vertex of the angle, and these two rays are called the two edges of the angle.

Dynamic Definition of Angle The shape formed by the rotation of a ray from one position to another around its endpoint is called an angle. The end point of the rotated ray is called the vertex of the angle, the ray at the beginning position is called the beginning edge of the angle, and the ray at the end position is called the end edge of the angle.

Two rays have common vertices.

That's right, it's best to draw the first one parallel to the edge of the table, and then draw the other side.

Yes, with a triangle, a protractor will be more accurate.

Yes, two rays have vertices so they are not straight lines.

A tape measure, a calculator).

On the plane, it is good to set two points A, B, and AB is long as the sedan car is the hypotenuse, and the sine value and cosine value of the angle are calculated with a calculator, and Youqingnai calculates A=ABSIN16°, B=ABCoS16°, and determines a point C on the plane, so that AC=B, BC=A, then the angle A is the angle sought.

I don't know if the "ruler" mentioned in the original title is a ruler or a scale ruler, what kind of line is the "line", the line used to draw a straight line or a soft ruler with a scale - line? And without other "props", do calculators, math tables, pens and paper, and the Internet count? ）