How to operate the value measure of a geometric sketchpad point that is not on the path

How to measure the value of points that are not on the path in the geometric sketchpad? PHP editor Xinyi will bring you the geometric sketchpad point value measurement operation method today. He will introduce in detail how to measure the value of points that are not on the path and solve the measurement problem.

For points that are not on the path, the value of the measurement point is also used more often. Here is an example to illustrate.

Point P on line segment AB, divide AB into three equal parts, and connect the equal points to obtain line segments AC, CD and DB. At this time, select point P and measure the value of the point. The result of the measurement is point The value of P on line segment AB, then how to measure the value of point P on line segments AC, CD and DB? We know that point P is not on these three line segments. Therefore, if you want to measure the value of a point that is not on the path, you must select the point and path and hold down the Shift key on the keyboard to measure.

This can be understood as: the projection point of point P on the line segment (that is, the intersection of the perpendicular line of the line segment through point P and the line segment. When the intersection does not exist, it is the line segment. For example, in the above figure, the value of point P on line segment AC is 1, because the projection point does not exist, and at this time point P is close to point C relative to line segment AC, so the projection Point defaults to point C. In the same way, we can understand the value of point P on line segment DB.

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