How to draw the symmetrical point in the geometric board with the axis line

Step one draws the point and the symmetric axis. Open the Geometry artboard, select the left toolbox "point Tool", draw a random point in the artboard space A; Select "segment Tool", in the vicinity of point a arbitrarily draw a line of BC, line as the axis of symmetry, can be in any direction, not necessarily the vertical state, as shown in the following figure.

Example of drawing points and symmetric axes in a geometric artboard

Step two pairs of symmetry axis BC execute Mark Mirror command. Select the "Move Arrow Tool", the mouse click on the segment BC, so that it is selected, click the above "Transform" menu, in its drop-down menu select "Mark Mirror" command (as shown in the following image), so that the line segment BC will appear marked process.

Performing a marker mirror command example for a segment BC

Step three to point A to reflect, get the symmetry point. Select the "Move Arrow Tool", click on the mouse point A, so that it is selected, click the "Transform" menu, in its Drop-down menu select "Reflection" command, so that the point a about the line of BC Symmetry point a ', as shown in the following figure.

To get point A. Example of a symmetric point about a segment BC