"Using Rulers and Compasses to Construct Angle" Parallel Lines and Intersecting Lines PPT Courseware

Description

"Using Rulers and Compasses to Construct Angle" Parallel Lines and Intersecting Lines PPT Courseware

Review & Thoughts

1. Construct a line segment equal to the known line segment

Many geometric figures can be made using unscaled rulers and compasses. Do you remember how we used compasses and rulers to draw a line segment equal to a known line segment?

Known: line segment AB.

Find the construction: line segment A’ B’, so that A’ B’=AB.

Practice and demonstration:

(1) Make ray A’C’;

(2) Draw an arc with point A’ as the center and the length of AB as the radius. Intersect line A’ C’ at point B’. A’B’ is the line segment you want to construct.

What did you learn in this lesson?

summary

This lesson mainly involves learning how to use an unscaled ruler and compass to construct a line segment equal to a known line segment. Although it may seem simple, it is the most basic geometric drawing method. In mathematics, it is called the basic geometric drawing method in history. (one);

After class, the use of basic drawing tools should be strengthened, especially the essentials and techniques of using compasses should be practiced frequently.

During the exercises, attention should also be paid to the training of standardized geometric language expressions and standardized writing formats.

Practice in class

1. Known: ∠AOB.

Use a ruler and compass to make: ∠A’O’B’ so that ∠A’O’B’=2∠AOB.

give it a try

Make beautiful patterns with rulers and compasses

1. With point O as the center and r as the radius, draw a circle O;

2. Take any point on circle O as the center and r as the radius to construct a circle that intersects circle O at two points;

3. Draw a circle with the two intersection points as the center and r as the radius;

4. Continue and paint the appropriate areas. Can you create a beautiful "Zouju pattern"?

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For more information about the PPT courseware "Parallel lines and intersecting lines using a ruler and compass to construct angles", please click the Parallel lines and intersecting lines ppt to use a ruler and compass to construct angles ppt tag.

"Using Rulers and Compasses to Construct Angle" Parallel Lines and Intersecting Lines PPT Courseware 2:

"Using Rulers and Compasses to Make Angle" Parallel Lines and Intersecting Lines PPT Courseware 2 Is the Zou Ju pattern on the right beautiful? Do you want to draw it yourself? So let’s start with the first steps! Use a ruler and compass to make beautiful patterns 1. Take point O as the center and r as the radius to make a circle O; 2. Take the circle...

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Update Time: 2024-10-15

This template belongs to Mathematics courseware Beijing Normal University seventh grade mathematics volume 2 industry PPT template

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