幸运28

Postulate 1

To draw a straight line from any point to any point. A line can be drawn between any two points. On a piece of paper, draw two points, you can always connect those two points together with a line.

Tool Practice

In the applet below, use the Toolbar Image line tool to connect A to B. Use the Toolbar Image segment tool to connect A to C. Use the Toolbar Image ray tool to connect B to C. Once you have drawn those lines, mark the intersections of your lines with the red line by using either the Toolbar Image or Toolbar Image tools. Using Toolbar Image you can just click on the intersection or using Toolbar Image you can click on the lines and it will mark the intersection for you. Play around with these tools until you are comfortable with them