"Lines in Traffic" PPT Courseware 2

Description

"Lines in Traffic" PPT Courseware 2

teaching objectives:

1. Perceive the vertical and parallel phenomena in life

2. Preliminarily understand that vertical and parallel are two positional relationships between two straight lines in the same plane, and initially understand perpendicular and parallel lines.

Important points in teaching:

1. Characteristics of line segments, rays, and straight lines

2. Given a point or a straight line, make its perpendiculars and parallel lines

In the same plane, two straight lines that do not intersect are parallel to each other, and one of the straight lines is parallel to the other straight line.

When two straight lines intersect at right angles, the two straight lines are perpendicular to each other, and one of them is a perpendicular to the other straight line. The intersection of the two straight lines is called the vertical foot.

So how to draw parallel lines and perpendicular lines?

Discuss

Can you find perpendicular and parallel lines on the set square and ruler?

The right angles on the triangle can help us draw vertical lines

How to draw a straight perpendicular line passing through a point?

⑴ How to draw the perpendicular line of this straight line through a point on the straight line?

step:

⒈Coincide a right-angled side of the triangular plate with the known straight line.

⒉Move the triangular plate along the known straight line so that the right-angled vertex of the triangular plate coincides with the known point on the straight line.

⒊Draw a straight line passing through the known point along the other right-angled side.

4. Mark the vertical symbol.

⑵. How to draw the perpendicular of this straight line through a point outside the straight line?

Drawing steps

1. Use a right-angled side of the triangle plate to coincide with the known straight line.

2. Use a ruler close to the other right-angled edge of the triangle.

3. Translate the triangle along the ruler so that the right-angled side coincident with the known straight line passes through the known point.

4. Draw a straight line along this right-angled side, parallel to the known straight line.

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"Lines in Traffic" PPT courseware 3:

"Lines in Traffic" PPT Courseware 3 Teaching Objectives: Combined with specific situations, understand the shortest line segment among all connections between two points. Know the distance between two points and the distance from a point to a straight line. In the process of solving problems, experience mathematics and daily production Close contact fosters observation,..

"Lines in Traffic" PPT courseware:

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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