Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Hebei Education Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Hebei Education Edition Seventh Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Interior and exterior angles of a triangle" PPT download
Part 1: Think about it
What is the sum of the three interior angles of a triangle?
Is there any way you can verify this?
Tip: Try putting three corners together
Proof: As shown in the figure:
Extend BC to CD as CE∥AB
Then ∠1=∠A
(Two straight lines are parallel and their internal offset angles are equal)
∴∠B=∠2
(Two straight lines are parallel and have equal angles).
Also ∵∠1+∠2+∠ACB=180°
(Sum of interior angles of a triangle theorem)
∴∠A+∠B+∠ACB=180° (equivalent substitution)
Conclusion: The sum of the interior angles of a triangle is equal to 180°.
Interior angles and exterior angles of triangles PPT, Part 2 content: Application of new knowledge
(1) In △ABC, ∠A=35°, ∠B=43°
Then ∠ C=______.
(2) In △ABC, ∠A :∠B:∠C=2:3:4
Then ∠A =______ ∠ B=______ ∠ C=______ .
discuss
(1) How many ____ right angles are there in a triangle? why?
(2) There are at most ____ obtuse angles in a triangle? why?
(3) There are at least ____ acute angles in a triangle? why?
(4) In any triangle, the largest angle has a measure of at least ____.
Interior angles and exterior angles of a triangle PPT, Part 3 content: Class topics
1. As shown in the picture, a classmate broke a triangular piece of glass into three pieces. Now he wants to go to a glass shop to get a piece of glass with exactly the same shape. So the easiest way is ()
(A) Take ① with you (B) Take ② with you (C) Take ③ with you (D) Take ① and ② with you
2 In △ABC, ∠A=80°, ∠B=∠C, find the degree of ∠C.
Solution: In △ABC,
∠A+∠B+∠C=180°, ∠A=80°
∴∠B+∠C=100°
∵∠B=∠C
∴∠B=∠C=50°
3. It is known that the ratio of the measures of the three interior angles of a triangle is 1:2:3. Find the measures of these three interior angles.
Solution: Let the three interior angles be: x, 2x, 3x.
List the equation x+2x+3x=180°
x=30°
Answer: The three internal angles are 30°, 60° and 90° respectively.
Conclusion: The two acute angles of a right triangle are mutually supplementary
Interior angles and exterior angles of triangles PPT, Part 4 content: Tracking exercises:
1In △ABC, if ∠A+∠B=∠C, then △ABC is ( )
A. Acute angle △ B. Right angle △ C. Obtuse angle △ D. Isosceles △
2 A triangle has at least ( )
A. One acute angle B. Two acute angles C. One obtuse angle D. One right angle
Keywords: Free download of Hebei Education Edition mathematics PPT courseware for seventh grade volume 2, interior and exterior angles of a triangle PPT download, .PPT format;
For more information about the "Interior and Exterior Angle of a Triangle" PPT courseware, please click on the "Interior and Exterior Angle of a Triangle ppt" tab.
"Interior and Exterior Angle of Triangle" PPT courseware:
"Interior Angle and Exterior Angle of a Triangle" PPT courseware Part One Content: Interior Angle and Exterior Angle of a Triangle Review Questions: 1. What are the interior angles of a triangle? 2. What is the relationship between the three interior angles of a triangle? Jigsaw Puzzle: Tear off the three interior angles of a triangle..
"Interior and Exterior Angle of Triangle" PPT:
"Interior Angle and Exterior Angle of Triangle" PPT Part One Content: Review the past and learn new things 1. Related concepts of triangles: 1. What is a triangle: A figure composed of three line segments that are not on the same straight line and are connected end to end is called a triangle. 2. Vertex: Use a big...
File Info
Update Time: 2024-10-20
This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 2 industry PPT template
"Interior and exterior angles of a triangle" PPT download Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Interior and exterior angles of a triangle" PPT download is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Interior and exterior angles of a triangle" PPT download, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)