Western Normal University Edition First Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Jiangsu Education Edition Fourth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Second Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
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Category | Format | Size |
---|---|---|
Qingdao Edition Fourth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Busy Construction Site" PPT Courseware 4
1. The figure formed by two rays drawn from a point is called an angle.
How are these three corners drawn?
Draw a point first, and then draw two rays.
2. Names of each part of the angle and how to express the angle.
Angle is usually represented by the symbol " ", pronounced: "angle"
(Note the difference with the less than sign "�".)
If there are several corners, number them respectively (write 1, 2, 3, etc. inside the corner)
They are recorded as: ∠1, ∠2, ∠3.
1. Protractor
The unit of measurement for angle is "degree", represented by the symbol "°". Divide the semicircle into 180 equal parts, and the angle subtended by each part is called a first-degree angle. Record it as "1°".
2. 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.
3. Steps to draw a 65° angle:
(1) Draw a ray so that the center of the protractor coincides with the endpoint of the ray, and the 0 scale line coincides with the ray.
(2) Click a point at the 65° mark of the protractor.
(3) Taking the endpoint of the drawn ray as the endpoint, draw another ray through the point just drawn.
(4) After drawing, mark the corners with symbols and write the degrees.
How to draw a 15° angle using a triangle?
You can use a triangle ruler to draw angles of 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, 165°, and 180°. There are so many angles! You can use a protractor to draw other angles!
Consolidation exercises
Draw angles of 30°, 45°, 60°, 90°, and 120°.
Keywords: Busy Construction Site Teaching Courseware, Qingdao Edition Fourth Grade Mathematics Volume 1 PPT Courseware Download, Fourth Grade Mathematics Slide Courseware Download, Busy Construction Site PPT Courseware Download, .PPT format;
For more information about the "Busy Construction Site" PPT courseware, please click the "Busy Construction Site" ppt tab.
"Busy Construction Site" PPT courseware 3:
"Busy Construction Site" PPT courseware 3 1. Situation introduction The surface area of the entire Water Cube building reaches 100,000 square meters. The surface of the entire Water Cube building is covered with air pillows, covering an area of 100,000 square meters, making it the largest in the world. Based on this information, what can you suggest...
"Busy Construction Site" PPT Courseware 2:
"Busy Construction Site" PPT courseware 2 Learning objectives: 1. Understand angles and master the classification of acute angles, right angles, obtuse angles, straight angles and circumferential angles. And know the relationship between right angles, square angles and circumferential angles. 2. Be able to use a protractor to measure angles. 3. Be able to use a protractor to draw angles of specified degrees..
"Busy Construction Site" PPT courseware:
"Busy Construction Site" PPT Courseware What is a triangle? A figure surrounded by three line segments is called a triangle. A triangle has three sides, three vertices, and three angles. Who will decide which of the following shapes are triangles? Which ones are not? Please explain why. Take a look: Everyday life...
File Info
Update Time: 2024-09-04
This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template
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