"Parallel Lines" PPT courseware

Description

"Parallel Lines" PPT courseware

Part One: Learning Objectives

1. Understand the concept of parallel lines.

2. Understand that "the distance between two parallel lines is equal everywhere."

3. Understand and master "through a point outside the known straight line, there is and is only one straight line parallel to the known straight line" and "with equal angles, two straight lines are parallel."

4. Understand and master the expression of reasoning.

Parallel lines PPT, part 2: analysis of parallel lines

1. Definition of parallel lines:

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

draw a set of parallel lines

2. How to draw parallel lines:

(1) put

(2) rely on

(3) Move

(4) Painting

Draw two sets of parallel lines in different directions

3. Representation of parallel lines:

We usually use "//" to indicate parallelism.

AB∥CD

Read: "AB is parallel to CD"

a∥b

Read as: "a is parallel to b"

Parallel Lines PPT, Part 3: Cooperation and Exchange

Cooperation and exchange one

1. (1) Use symbols to express the positional relationship between the two edges:

A1B1___AB, AA1____AB,

A1D1____C1D1,AD___BC.

(2) The straight lines where A1B1 and BC are located are two non-intersecting straight lines. They are __________ parallel lines (fill in "yes" or "no"). It can be seen that only two non-intersecting straight lines can be called parallel lines within __________.

Cooperation and exchange two

As shown in the figure, as long as which pair of angles are equal, a∥b can be made? Point out such corners.

basic facts

If two straight lines are intercepted by a third straight line, if the angles are equal, then the two straight lines are parallel.

For example, in the figure, ∠1 = 55°, ∠2 = 55°, are straight lines a and b parallel? Why?

Solution: a∥b.

The reason is:

∵∠ 1 = 55°, ∠2 = 55°, (known)

∴∠ 1= ∠ 2 (equivalent substitution).

∴ a∥b (the angles are equal and the two straight lines are parallel).

Parallel Lines PPT, Part 4: Theorem Examples:

1. Properties of supplementary angles: Supplementary angles of identical or equal angles are equal.

2. Properties of supplementary angles: The supplementary angles of identical or equal angles are equal.

3. Properties of opposite vertex angles: opposite vertex angles are equal.

4. Properties of vertical lines:

① Passing through a point on a straight line or outside a straight line, there is and is only one straight line that is perpendicular to the known straight line;

②The vertical line segment is the shortest.

5. Judgment of parallel lines: The angles of parallel lines are equal and the two straight lines are parallel.

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for seventh grade volume 2, parallel lines PPT download, .PPT format;

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

"Properties of Parallel Lines" PPT download:

"Properties of Parallel Lines" PPT Download Part 1 Content: Review Review What are the methods for determining parallel lines? How to identify parallel lines: (1) the angles of the same angles are equal, two straight lines are parallel (2) the internal angles are equal, the two straight lines are parallel (3) the internal angles on the same side are complementary, Two straight lines are parallel...

"Properties of Parallel Lines" PPT:

"Properties of Parallel Lines" PPT Part One Content: Knowledge Review 1. If B=1, according to _______________, we can get AD//BC 2. If 1=D, according to _______________, we can get AB//CD 3. If B+BCD=180, according to___..

"Properties of Parallel Lines" PPT courseware download:

"Properties of Parallel Lines" PPT courseware download Part 1 content: Do a hands-on experiment: Select any two parallel lines a, b on the prepared grid book (1) Draw a straight line c and parallel lines a, b arbitrarily intersect. (2) Choose any pair of co-positioned angles and measure them with a protractor...

File Info

Update Time: 2024-09-07

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 2 industry PPT template

Preview