Question 1: How to make the bisector of an angle (figure step) leads a ray from the vertex of an angle and divides it into two identical angles. This ray is called the bisector of this angle.

The intersection of bisectors of three angles of a triangle is called the center of the triangle. The distance from the center of a triangle to the three sides is equal, which is the center of the inscribed circle of the triangle.

The way of doing things

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Angular bisector method

Method 1: 1. Draw an arc with O point as the center and any length as the radius. Both sides of the intersection angle AOB of two arcs are at points M and N. ..

2. Draw an arc with points M and N as the center and the length greater than 1/2MN as the radius, and the two arcs intersect at point P. ..

3. Perform ray operation.

The ray OP is the bisector of the angle AOB.

Proof: connect PM and PN.

In △POM and △PON.

OM = on, PM=PN, PO=PO.

∴△POM≌△PON(SSS)

∴∠POM =∞∠pon, that is, the light OP is the bisector of the angle AOB.

Of course, there are many ways to do the angle bisector. Next, a ruler drawing method is provided for your reference.

Method 2: 1. Intercept OM, OC and ON, OD on both sides of OA and OB so that OM=ON, OC = OD.

2. Connect CN and DM, which intersect at point P;

3. Perform ray operation.

The ray OP is the bisector of the angle AOB.

Question 2: Mathematics Book 1 How to Make the bisector of the angle Method 1: Use a protractor.

Method 2: 1. First, draw an arc with the vertex of the angle as the center and any length as the radius with compasses, and there are two intersections on both sides.

2. Draw an arc with two intersection points as the center and the connecting line of two points greater than 1/2 as the radius.

Two arcs intersect at one point, and the vertex and intersection point of the connecting angle is the bisector of the angle-the owner of the little woman fashion house will answer for you.

Question 3: Drawing with a ruler: How to make an angle bisector? 1 Make an angle AOB, with point O as the center and any length as the radius, which intersects with rays OA and OB at points C and D respectively.

2 Take point C and point D as the center, and the length greater than half of CD as the radius. The two arcs intersect at point M within the angle AOB.

3 connect OM and expand. OM is the bisector of angle AOB.

Question 4: How to use a ruler to make the bisector of an angle? Put the compass at the vertex, draw an arc with a certain radius, draw two points on each side of the triangle, and then draw an arc with these two points as the center. The line between the points and vertices of two arcs is the bisector of an angle.