"Parallel" basic plane graphics PPT courseware

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"Parallel" basic plane graphics PPT courseware

parallel lines

Two straight lines that do not intersect in the same plane are called parallel lines.

In the same plane, the positional relationship between two straight lines is parallel or intersecting.

Do it

Can you draw parallel lines on graph paper? How many painting methods are there?

Can you draw parallel lines with the help of a set square?

Representation of parallel lines

Usually, we use "∥" to indicate parallelism.

As shown in the figure, straight line AB is parallel to straight line CD, denoted as AB∥CD.

If m and n are used to represent these two straight lines, then m and n are parallel and denoted as m∥n.

judge

1. Two straight lines are parallel unless they intersect. ( )

2. In the same plane, two straight lines with a common point are also parallel lines. ( )

3. Through a point outside the straight line, there is one and only one straight line parallel to the known straight line. ( )

4. Countless sets of parallel line segments can be drawn on an arbitrarily large piece of paper covered with identical squares. ( )

fill in the blank:

1. It is known that ∠AOB and any point P within it, if a straight line is drawn through point P and parallel to OA, then there are ( ) such straight lines.

2. Both pencils are parallel to the same edge of the table, then the positional relationship between the two pencils is ( ).

3. If a∥b, c∥d, we ( ) [ fill in “can” or “cannot” ] judge a∥c. (different letters represent different straight lines)

practise:

1. The positional relationship between two straight lines in the same plane ( )

2. Which of the following statements is correct ( )

A. In the same plane, two non-parallel line segments must intersect

B. In the same plane, two line segments that do not intersect are parallel lines

C. Two rays or line segments are parallel, which means that the straight lines where they are located are parallel.

3. There are three straight lines in the same plane. If there are and only two are parallel, then the number of intersections of these three straight lines is

A.0 B.1 C.2 D.3

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For more information about the PPT courseware "Basic Parallel Plane Figures", please click on the "Basic Plane Figures ppt Parallel ppt" tab.

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Update Time: 2024-10-04

This template belongs to Mathematics courseware Beijing Normal University seventh grade first volume mathematics industry PPT template

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