"Angles of the same position, internal angles, internal angles on the same side" Intersecting lines and parallel lines PPT courseware 2

Description

"Angles of the same position, internal angles, internal angles on the same side" Intersecting lines and parallel lines PPT courseware 2

teaching objectives:

1. Observe the special positional relationship of angles in "Three Lines and Eight Angles", and summarize the definitions of concentric angles, internal offset angles, and congruent internal angles.

2. According to the definition, concentric angles, internal offset angles, and congruent internal angles can be identified from figures.

Get to know the three-line octagonal

As shown in the figure: if straight lines AB and CD intersect with EF, we say that straight lines AB and CD are intercepted by straight line EF. Three straight lines intersect to form the 8 angles in the figure. Among them, AB and CD are called intercepted lines, and EF is called the intercepting line.

1. Isotopic angle

As shown in the figure: straight line EF intersects straight lines AB and CD

Observe the characteristics of ∠1 and ∠5 in terms of position.

For example, ∠1 and ∠5 are on the same side of the straight line EF, and on the same side of the straight lines AB and CD. The pair of angles at such positions are co-position angles.

2. Internal wrong angle

As shown in the figure: straight line EF intersecting straight lines AB and CD

What are the characteristics of ∠3 and ∠5 in terms of position?

For example, ∠3 and ∠5 are on both sides of the straight line EF and between the straight lines AB and CD. A pair of angles at such a position is an internal angle.

3. Interior angles on the same side

As shown in the figure: straight line EF intersecting straight lines AB and CD

Observe the characteristics of ∠3 and ∠6 in terms of position.

For example, ∠3 and ∠6 are on the same side of the straight line EF and between the straight lines AB and CD. A pair of angles at such a position are interior angles on the same side.

Give it a try:

Fill in the blanks as required based on the graphic:

(1) ∠1 and ∠2 are ______ obtained by intercepting straight lines ______ and ______ by straight lines ______.

(2) ∠1 and ∠3 are ______ obtained by intercepting straight lines ______ and ______ by straight lines ______.

Life contact:

(1) The school and the playground are the ______ corner between ( ) road and ( ) road intercepted by ( ) road.

(2) What is the internal angle relationship with the location of the school ( )

A. Amusement park B. Bookstore C. Supermarket

(3) What is the relationship between the location of the school and the bookstore?

summary

1. The conditions for producing congruent angles, internal angles, and internal angles on the same side: two straight lines are intercepted by a third straight line (referred to as "three lines and eight angles").

2. Methods of finding congruent angles, interior angles, and congruent interior angles:

(1) First find the cutting line;

(2) Co-position angles are on the same side of the intercept line and on the same side of the intercept line.

(3) The internal offset angles are located on both sides of the section line and inside the section line.

(4) The interior angles on the same side are located on the same side as the intercepted line and inside the intercepted line.

Main content: Three types of angles produced when two straight lines are intercepted by a third straight line - congruent angles, interior angles, and congruent interior angles.

Notice:

1. The conditions and location characteristics of the three types of angles;

2. When judging, you should first find the "intersection" (the "intersection" is the common side of the two angles), then find the other two straight lines, and then decide which angle it is based on the position of the angle.

3. When the graphics are complex, you can cover the temporarily unnecessary line segments, corners, etc., or you can use graphic decomposition and graphic coloring methods to eliminate interference.

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For more information about the PPT courseware "Intersecting Lines and Parallel Lines of Parallel Internal Angles and Parallel Internal Angles", please click the Intersecting Lines and Parallel Lines of Parallel Angles and Parallel Internal Angles ppt tag.

"Angles of the same position, internal angles, internal angles of the same side" PPT courseware 2:

"Angles of the same position, internal angles, internal angles of the same side" PPT courseware 2 Learning objectives 1. Know the meaning of three lines and eight angles. 2. Understand the meaning of congruent angles, congruent angles, and congruent interior angles. 3. Be able to tell which two straight lines intersect two congruent angles, interior angles, and interior angles on the same side..

"Angles of the same position, internal angles, internal angles of the same side" PPT courseware:

Review of the PPT courseware "Angles of the same position, interior angles, interior angles on the same side": 1. What are the two positional relationships between two straight lines on a plane? (Parallel and intersecting) 2. How many angles do two straight lines intersect? (4) 3. What about two straight lines intersecting a third straight line? (8) 4.Can you find out...

"Angles of the same position, internal angles, internal angles on the same side" PPT courseware of intersecting lines and parallel lines:

"Angles of the same position, interior angles of the same side, interior angles of the same side" PPT courseware of intersecting lines and parallel lines. How many angles less than a straight angle are there cut by two straight lines AB and CD by a third straight line EF? Straight line EF----intersection straight line AB, CD----intercepted straight line One side is on the intersection line and in the same direction..

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Update Time: 2024-12-11

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 2 industry PPT template

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