"Understanding Right Angle" Understanding Graphics PPT

Description

"Understanding Right Angle" Understanding Graphics PPT

Part One: Learning Objectives

1. Combined with real life examples, experience the process of abstracting right angles from actual objects, and master the characteristics of right angles, acute angles and obtuse angles. (emphasis)

2. Can use the right angle on the triangle plate to determine acute and obtuse angles. (difficulty)

Review import

Indicate the components of the following two angles and compare the sizes of the two angles.

Understanding Right Angle PPT, Part 2: Exploring New Knowledge

Knowledge point 1: Understanding right angles

Students, can you tell me what are the characteristics of these corners?

They are all the same size, and they are all straight and square.

These are right angles.

Knowledge refining

How to use the right angle on a triangle plate to determine whether an angle is a right angle:

(1) Align the vertex of the right angle on the triangular plate with the vertex of the angle;

(2) Align one side of the right angle on the triangular plate with one side of the angle;

(3) Check whether the other side of the right angle on the triangle plate coincides with the other side of the angle. If they overlap, the angle is a right angle.

Knowledge point 2: Recognize acute angles and obtuse angles

Compare and recognize.

This angle is larger than a right angle and is an obtuse angle.

right angle

This angle is smaller than a right angle and is an acute angle.

Understanding right angles PPT, Part 3: Consolidation exercises

1. Compare with the triangle and fill in the blanks.

2. In each figure, mark 1 right angle, 1 acute angle and 1 obtuse angle.

3. Calculate and check.

612－224＝ 245＋176＝ 438＋371＝

4. Take a look and do it.

(1) Which piece of the tangram has a right angle? That board has an obtuse angle?

(2) Use the two boards in the tangram in Figure 2 on Appendix 3 to form a right angle and an acute angle respectively.

Understanding Right Angle PPT, Part 4: Class Summary

What knowledge have you learned in this class?

1. Use the right angle on the triangle plate to determine whether an angle is a right angle:

(1) Align the vertex of the right angle on the triangular plate with the vertex of the angle;

(2) Align one side of the right angle on the triangular plate with one side of the angle;

(3) Check whether the other side of the right angle on the triangle plate coincides with the other side of the angle. If they overlap, the angle is a right angle.

2. The largest angle in a triangle is called a right angle, an angle smaller than a right angle is called an acute angle, and an angle larger than a right angle is called an obtuse angle.

Understanding right angles PPT, part 5: homework

Assignment 1: Complete the exercises related to the textbook.

Assignment 2: Complete the corresponding exercises.

Keywords: Beijing Normal University Edition Second Grade Mathematics PPT courseware free download, understanding of right angles PPT download, understanding of graphics PPT download, .PPT format;

For more information about the PPT courseware "Understanding Figures and Right Angle", please click on the "Understanding Figures and Right Angle PPT" tab.

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Beijing Normal University Edition Second Grade Mathematics Volume 2 industry PPT template

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