The main content of chapter five includes four aspects.
The first aspect is parallel and vertical. In this respect, it is divided into three small points.
The first point is parallel lines, which are defined as two straight lines that do not intersect on the same plane. They are called parallel lines, or they are parallel to each other.
The second point, the vertical line, is defined as the intersection of two straight lines at right angles, that is, two straight lines are perpendicular to each other.
The third point is the distance from a point to a straight line. The vertical line drawn from a point outside the straight line is the shortest, and its length is called the distance from that point to the straight line.
The application of this test center is to draw rectangles and squares.
The second aspect is parallelogram.
It is characterized by two groups of parallelograms, the opposite sides of which are parallel and equal respectively, which has the characteristic of variability.
The third aspect is trapezoid.
The first test site is trapezoidal, with only one set of opposite sides parallel and the other set of opposite sides not parallel.
The second test site is two special trapezoid, namely isosceles trapezoid and right-angled trapezoid.
The fourth aspect is the relationship between quadrangles, which is also the focus of this chapter.
Quadrilateral includes parallelogram and trapezoid, parallelogram includes rectangle, and rectangle includes square.
Finally, you can draw a mind map.