Painting method:
The first step is to draw a little o on the paper at a suitable position, and then draw the ray OC with o as the endpoint.
? Note that when drawing, the ray OC is longer than the known line segment AB.
Step 2, measure the length of line segment AB with both feet of the compass (be careful not to move the compass after measurement).
? Next, take the endpoint O of the ray as the center and the length of the line segment AB just measured as the radius.
? Draw an arc on the ray OC, which has an intersection point d with the ray OC.
? Then the line segment OD is the line segment we want to draw, and its length is equal to the known line segment AB.
Note: If the topic requires us to draw a line segment with a length of 5cm or 10cm, then we should also draw a ray first.
? OC, and then measure 5cm or 10cm from the O point above the light OC, and mark d,?
Then OD is the line segment we want to draw. Others and so on.