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
Qingdao Edition Seventh Grade Mathematics Volume 2
Jiangsu Education Edition Fourth Grade Mathematics Volume 1
Qingdao Edition Second Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
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Category | Format | Size |
---|---|---|
Hebei Education Edition Seventh Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Sides of a Triangle" PPT courseware
Part One: Triangle Analysis
Triangle: A figure composed of three line segments that are not on the same straight line connected end to end.
Representation of triangle: Triangle ABC in the picture is recorded as: "△ABC" and pronounced as: "Triangle ABC"
A triangle has three sides, three vertices, and three interior angles
As shown in the figure: The three sides in △ABC are: AB, BC, AC
The three vertices are: A, B, C
The three interior angles are: ∠A, ∠B, ∠C
Note: The three sides can also be represented by lowercase letters a, b, c.
Definition of exterior angle: The angle formed by one side of a triangle and the extension of the other side is called the exterior angle of the triangle.
Think: How many exterior angles does a triangle have?
Conclusion: A triangle has 6 exterior angles
Part 2 content: Classroom exploration
Research: Prepare a set of small rods with lengths of 3cm, 4cm, 6cm and 8cm, take out 3 rods and connect them end to end to construct a triangle.
1. How many ways are there to pick any 3 roots? list them
2. Try to see which group connected end to end can form a triangle
3. In a set of small wooden sticks that can form a triangle, what is the relationship between the length of every two sticks and the length of the third stick? What about those that cannot form a triangle?
4. Could you please try it with small wooden sticks of other lengths to check whether your conclusion is correct?
in conclusion:
The sum of two sides of a triangle is greater than the third side
The difference between the two sides of a triangle is less than the third side
Sides of Triangle PPT, Part 3: Example Study
For example, can three line segments with lengths 6, 8, and 10 form a triangle?
Solution: Because 6+8>10, 6+10>8, 8+10>6.
Therefore, it is consistent with "the sum of any two sides of a triangle is greater than the third side."
Therefore, three line segments with lengths 6, 8, and 10 can form a triangle.
Find fault
Can three line segments with lengths 2, 4, and 6 form a triangle?
Solution: Because 6+4>2,6+2>4,
Therefore, it is consistent with "the sum of any two sides of a triangle is greater than the third side."
So can three line segments with lengths 2, 4, and 6 form a triangle?
It is known that the two sides of the triangle are 6 and 9 respectively. Find the value range of the third side?
Isosceles triangle: A triangle with two equal sides
Equilateral triangle: A triangle with three equal sides (also called an equilateral triangle)
Triangles are classified by sides:
triangle
oblique triangle
isosceles triangle
Equilateral triangle
Sides of Triangle PPT, Part 4: Judgment and Summary
judge:
1. A triangle with two equal sides is called an isosceles triangle. ( )
2. A triangle with only two equal sides is called an isosceles triangle. ( )
3. An equilateral triangle is an isosceles triangle. ( )
summary
1. Vertices, sides, interior angles and exterior angles of a triangle
2. Quantitative relationship between three sides
3. Classification of triangles according to sides
Keywords: Free download of Hebei Education Edition mathematics PPT courseware for seventh grade volume 2, PPT download of sides of triangle, .PPT format;
For more information about the "Side of a Triangle" PPT courseware, please click on the "Side of a Triangle ppt" tab.
"Sides of a Triangle" PPT:
"Side of a Triangle" PPT Part One Content: Introduction to the New Lesson Let's talk: What do you know about triangles? Pages 100-101 of the independent study textbook. Observation and thinking, what everyone talked about, continue to understand: 1. The concept of triangle 2. The sides of a triangle..
"Measuring the Height of an Object" The relationship between the sides and angles of a right triangle PPT courseware 2:
"Measuring the Height of an Object" The relationship between the sides and angles of a right triangle PPT courseware 2 1. How to measure the inclination angle You can use an inclinometer to measure the inclination angle. ----A simple inclinometer consists of a dial, a plumb bob and a support rod. The steps for using an inclinometer to measure the inclination angle are as follows: 1. Hold the support...
"Measuring the Height of an Object" PPT courseware on the relationship between the sides and angles of a right triangle:
"Measuring the Height of an Object" PPT courseware on the relationship between the sides and angles of a right triangle. Learning objectives: 1. Be able to make relevant reasoning and further understand the meaning of trigonometric functions. 2. Be able to calculate the trigonometric function values of 30, 45 and 60 angles. 3. Able to use triangles of 30, 45 and 60...
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Update Time: 2024-09-05
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