How to find oblique feet and vertical feet?

The method comprises the following steps:

1. An equation that determines a straight line or diagonal line, usually by measuring the slope and intercept.

2. Find the intersection of a straight line or diagonal line and a plane. This position is the inclined foot.

3. Make a vertical line from the inclined foot to the vertical line, and the position of the vertical line is the vertical foot.

The definition of oblique foot is: a straight line intersects a plane and is not perpendicular, then the intersection of oblique line and plane is called oblique foot.

The definition of vertical foot is: when a straight line is perpendicular to the plane, the intersection of the straight line and the straight line is called vertical foot.