"Understanding and Measurement of Angles" Lines and Angles PPT Courseware

Category	Format	Size
Hebei Education Edition Fourth Grade Mathematics Volume 1	pptx	6 MB

"Understanding and Measurement of Angles" Lines and Angles PPT Courseware

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Upload Time: 2024-11-25

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Description

"Understanding and Measurement of Angles" Lines and Angles PPT Courseware

teaching objectives

1. Experience the process of finding and understanding angles from specific things, and using existing experience and measurement methods to compare the sizes of two angles.

2. Recognize the symbol “∠” that represents an angle, be able to read and write angles, and be able to use a protractor to measure the degree of a specified angle.

3. Actively participate in mathematical activities, gain successful emotional experience, and feel the scientific nature of measurement tools.

Observe the pictures below and tell what each picture is.

Recorded as: ∠1. Written as: ∠ABC or ∠B.

Pronounced: angle 1. Pronounced: angle ABC or angle B.

Steps to measure angles with a protractor

1. Place the protractor on top of the angle; make the center of the protractor coincide with the vertex of the angle;

2. The zero-degree scale line coincides with one side of the angle;

3. The scale on the protractor opposite the other side of the angle is the measure of the angle.

practice

1. Measure the degrees of each angle below and write them down.

2. First look at the clock face and fill in the blanks, then measure the angle.

3. Draw an angle at will and measure the angle.

4. Use a piece of rectangular paper to fold one corner, then open it and measure the two corners.

∠1＝( )

∠2＝( )

5. Measure the degrees of each angle in the figure below. What did you find?

∠1＝( ) ∠3＝( )

∠2＝( ) ∠4＝( )

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For more information about the PPT courseware "Line and Angle Recognition and Measurement of Angle", please click the Recognition and Measurement of Line and Angle ppt ppt tag.

File Info

Update Time: 2024-11-25

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

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"Understanding and Measurement of Angles" Lines and Angles PPT Courseware