"Sides of a Triangle" Triangle PPT Courseware 2

Description

"Sides of a Triangle" Triangle PPT Courseware 2

learning target

Understand triangles, understand the definition of triangles, know the sides, interior angles, and vertices of triangles, and be able to express triangles in symbolic language.

Able to classify triangles from different angles.

Master the unequal relationship between the three sides of a triangle and be able to use the unequal relationship between the three sides of a triangle to solve practical problems in life.

triangle definition

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.

be careful:

(1) Three line segments

(2) Not on the same straight line

(3) Connected from beginning to end in sequence

The three sides of triangle ABC are sometimes represented by a, b, and c.

Generally, the edge opposite to vertex A is denoted as a, the edge opposite to vertex B is denoted as b, and the edge opposite to vertex C is denoted as c.

1. Line segments AB, BC, and CA are called sides of a triangle.

2. Points A, B, and C are called the vertices of the triangle.

3. ∠ A, ∠ B, ∠ C are called the interior angles of a triangle, or simply the angles of a triangle.

think about it

What triangles are there according to the size of the three angles? (independent thinking)

(acute triangle, right triangle, obtuse triangle)

What triangles are there according to the size relationship of the three side lengths? (independent thinking)

(equilateral triangle, isosceles triangle, scalene triangle)

Think: What do isosceles triangles and equilateral triangles have in common?

How can triangles be classified? (Communicate with peers)

Notice:

1. The relationship between the three sides of a triangle can be summarized in the following sentence: the sum of any two sides of a triangle is greater than the third side, and the difference between any two sides is less than the third side.

2. When solving the problem, you must not only consider that the sum of the two sides is greater than the third side, but also that the difference between the two sides is less than the third side.

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For more information about the "Sides of Triangles" PPT courseware, please click the "Sides of Triangles ppt" ppt tag.

"Sides of a Triangle" PPT courseware:

The first part of the "Side of a Triangle" PPT courseware content: Triangle analysis Triangle: a figure composed of three line segments that are not on the same straight line connected end to end. Representation of a triangle: Triangle ABC in the picture, recorded as: △ABC, read Make: Triangle ABC ..

"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...

File Info

Update Time: 2024-09-09

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

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