7
/
13
（
4
）
Cross line display/hide ---- Click the drop-down icon to choose
cross line/tick mark display or hide.
（
5
）
Parallel line-first draw a line through two points, and then continue
to find a point on the other line, the second line will be drawn automatically,
and the system will automatically measure the distance between the two lines.
（
6
）
Point to line-point a point on the line and then draw a line by
picking two points. Measure the distance from the first point to this line.
（
7
）
Angle-----Draw a line through two points first, and then draw
another line through two points, and the system will automatically calculate the
angle between the two lines.
（
8
）
Rectangle----Two points can be selected, and the system will draw
a rectangular box based on these two points.
（
9
）
Radian----A circular arc can be drawn through three points.
（
10
）
Circle----You can draw a circle by taking a circle from three
points.
（
11
）
Concentric circles ---- You can draw the first circle by taking a
circle from three points and then drag the mouse to select a point on the edge
of the second circle to draw the second circle.
（
12
）
Polygon ---- You can click and fetch points according to the
position of the polygon, and the system will automatically connect the points.
When selecting the last point, you can press the right mouse button, and the
system will automatically connect the last point after the first point to form a
closed graph. Note that the polygon can only pick up to 10 points.
（
13
）
Point to circle----Select a point first, and then draw a circle
