1, ensure tangency: when connecting a straight line and an arc, it is necessary to make the center and tangent point of the arc to ensure tangency of the straight line and the arc. Make the center of the circle: make a parallel line with arc radius from two known straight lines, or make a concentric circle from a known arc, and you can find the center of the circle.

2. Make a tangent point: when connecting a straight line with an arc, you need to make a tangent point, and you can find the tangent point by making a vertical line. Connecting arc: take the center of the circle as the center and the radius as the radius, and make an arc between two tangent points, which is the required connecting arc. Tip: When connecting straight lines with arcs, you need to ensure tangency. You can find the center of the circle by drawing parallel lines and the tangent point by drawing vertical lines.

3. Understand the tangent relationship: the tangent relationship between straight lines and arcs is the key to connecting them. To understand the meaning of tangency, know how to judge whether a straight line and an arc are tangent and how to find the tangent point. Familiar with common shortcut keys: In drawing software, there are usually some shortcut keys that can help you complete common operations quickly. Familiarity with these shortcut keys helps to improve drawing efficiency.

4. Learn to use auxiliary lines: auxiliary lines can play a great role in drawing the connection between straight lines and arcs. Learning to use appropriate auxiliary lines can help you find the center and tangent point more accurately.

5. Practice and summary: A lot of practice is the key to mastering the skills of drawing straight lines and arcs. Try a variety of different connection methods, sum up experience and lessons, and constantly optimize your painting skills. Seek guidance: If you encounter difficulties in practice, you may wish to seek professional guidance. You can get valuable suggestions and feedback by asking questions from experienced draftsmen or teachers.

The knowledge about straight lines and arcs is as follows:

1. According to the relationship between a point and the center of a circle, a straight line and an arc can intersect the center of a circle through a common point. From the relationship between distance and angle, the distance between straight line and arc can be calculated by measuring the distance from point to straight line.

2. From the point of view of mathematics and physics, straight lines and circular arcs can be expressed by mathematical formulas or physical models, and the relationship between them can be explored through mathematical operations or physical experiments.