"Initial Understanding of Angles" PPT (Lesson 2)

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"Initial Understanding of Angles" PPT (Lesson 2)

Part One: Review Import

1. An angle has () vertices and () sides.

2. Determine which of the following shapes are angles.

Preliminary understanding of angle PPT, the second part of the content: exploring new knowledge

1. Understand right angles

Can you find the corners of these items?

The three angles above are all right angles, and right angles are usually represented by special symbols.

2. Determine right angle

How can you accurately determine whether an angle is a right angle?

The way to determine a right angle is: first put the right-angled vertex on the triangular board and the vertex of the angle together, then put a right-angled side on the triangular board overlapping with one side of the angle, and see if the other right-angled side on the triangular board is also consistent with the angle. The other side of the angle coincides. If they do not overlap, the angle is not a right angle; if they overlap, the angle is a right angle.

3. Right angle

Follow the teacher to make a right angle. Take a piece of paper, fold it in any direction, and then fold it in half along the crease. The angle between these two sides is a right angle. Touch it with your hand and feel the size of the right angle.

What do you think a right angle looks like? Let’s talk to everyone.

4． draw right angles

Students all know right angles. Now we have to draw a right angle. What are your ideas?

How do you draw a right angle, and what should you pay attention to when using a triangle to draw a right angle?

The right angle the teacher drew on the blackboard is larger than the right angle you drew, right? Why?

Preliminary understanding of angle PPT, the third part: Consolidation of application

1. Use a triangle ruler to compare whether the angles on the textbook cover are right angles.

2. Count how many right angles there are in each of the figures below.

3. Which of the following angles are right angles?

4. Draw a right angle on the graph paper (start from the point given)

5. Surround a square and a rectangle on the nail board as shown below.

Preliminary understanding of corners PPT, part 4 content: Class summary

Through studying this lesson, what do we know about right angles?

If the teacher asks you to use the movable angle to make a right angle, what can you do?

Keywords: Free download of second-grade mathematics PPT courseware from People's Education Press, PPT download of preliminary understanding of angles, .PPT format;

For more information about the "Preliminary Understanding of Corners" PPT courseware, please click on the "Preliminary Understanding of Corners" PPT tab.

"Initial Understanding of Angles" PPT (Lesson 3):

"Preliminary Understanding of Corners" PPT (Lesson 3) Part One: Situation Introduction Take out the prepared round paper and start folding the corners, and compete to see who can fold the corners in the most ways. What did you find? In this lesson we will study these angles except right angles. ... ... ... Angular..

"Initial Understanding of Angles" PPT (Lesson 1):

"Preliminary Understanding of Corners" PPT (Lesson 1) Part One: Situation Introduction Students, take a closer look. There are many shapes we have learned on the playground. Do you see them? Today, the teacher is going to introduce you to a new graphic friend, which is the corner. .....

"Initial Understanding of Corners" PPT:

"Preliminary Understanding of Corners" PPT Part One Content: Situation Introduction Looking for Corners in Life Today we will learn the preliminary understanding of corners together. ... ... ... Preliminary understanding of angles PPT, part 2: Exploring new knowledge (1) Preliminary understanding of angles A angle has...

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Update Time: 2024-11-18

This template belongs to Mathematics courseware People's Education Press Second Grade Mathematics Volume 1 industry PPT template

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