"Parallel Lines" Intersecting Lines and Parallel Lines PPT Courseware 3 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Parallel Lines" Intersecting Lines and Parallel Lines PPT Courseware 3
1. Learning objectives
1. Understand the parallel relationship between two straight lines and master the relevant symbolic representations.
2. Learn to use a triangle ruler and protractor to draw parallel lines.
3. Master the properties of parallel lines.
2. Key points and difficulties
Focus: Understand the relationship and related properties of two parallel lines.
Difficulty: Draw parallel lines and understand the meaning of parallel lines.
In-class exercises
1. Decide whether the following statements are correct and explain the reasons.
①Two straight lines that do not intersect are parallel lines.
② In the same plane, two non-intersecting line segments are parallel lines.
③After a point, you can and can only draw a straight line parallel to the known straight line.
2. Use the symbol "∥" to indicate that the two opposite sides of the parallelogram in the figure are parallel.
AB∥CD, AD∥BC.
Consolidation exercises
Which of the following statements is correct ( )
A. In the same plane, the positional relationships of two straight lines include intersection, perpendicular, and parallel.
B. In the same plane, two straight lines that are not perpendicular must be parallel.
C. In the same plane, two straight lines that are not parallel must be perpendicular.
D. In the same plane, two straight lines that do not intersect must not be perpendicular.
Do it
A cuboid is shown in the figure. How many edges are parallel to AA′? How many edges are there parallel to AB? Please represent them using symbols.
There are three edges parallel to AA′:
BB′∥AA′, CC′∥AA′, DD′∥AA′.
There are three edges parallel to AB:
A′B′∥AB, C′D′∥AB, CD∥AB.
give it a try
(1) Can you draw parallel lines in the square in the picture on the right?
method:
①Use the straight lines on the graph paper to draw parallel lines.
②Use the grid points (diagonals of the rectangle) to draw parallel lines.
(2) If you change the graph paper to white paper, which of the following tools can you use: ① Ruler ② Triangle ③ Protractor Can you draw parallel lines to the known straight line AB? How many lines can be drawn?
Do it
Which of the following statements is correct ( )
A. In the same plane, two rays that do not intersect are parallel lines;
B. In the same plane, two line segments that do not intersect are parallel lines;
C. In the same plane, the positional relationship between two straight lines is parallel unless they intersect;
D. Two straight lines that do not intersect are parallel lines.
summary:
1. Definition of parallel lines:
Two straight lines that do not intersect in the same plane are called parallel lines
2. Representation of parallel lines
Parallelism is usually represented by the symbol "//". AB//CD or a//b
3. Two properties of parallel lines
Parallel Axiom: (Uniqueness)
In the plane, through a point outside the straight line, there is one and only one straight line parallel to this straight line.
Corollary: If two straight lines are parallel to a third straight line, then the two straight lines are also parallel to each other.
(Transitivity of parallel lines) If a//c,b//c; then a//b
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