"Skillful Little Craftsman" PPT courseware 4

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"Skillful Little Craftsman" PPT courseware 4

1. Review

Think about those plane graphics we learned before?

Two: Picture Appreciation

Three: Collaborative exploration

Think about it: are triangles so widely used in our lives?

Triangles are stable

Draw a triangle you like in your exercise book and observe how many sides, angles, and vertices the triangle has.

Each line segment that surrounds a triangle is called a side of the triangle.

The intersection of every two line segments is called the vertex of the triangle.

A triangle has ( ) sides, ( ) vertices, and ( ) angles.

What is a triangle?

A figure surrounded by three line segments (the endpoints of every two adjacent line segments are connected) is called a triangle.

Choose the correct answer and put the serial number in the brackets:

1. A figure surrounded by three lines ( ) is called a triangle.

straight line segment ray

2. The triangle in ( ) is called an acute triangle.

One angle is acute. Two angles are acute. Three angles are acute.

3. In a right triangle, ( ).

There is only one right angle, three acute angles, and only one obtuse angle.

4. In a triangle, the largest angle is 150. This triangle must be ( ).

Acute triangle Right triangle Obtuse triangle

Fill in the blanks: A triangle is composed of ( ) sides, ( ) vertices, and ( ) angles.

judge:

1. A figure with three line segments must be a triangle. ( )

2. A figure composed of three line segments is called a triangle. ( )

3. A triangle has three sides, three angles, and three vertices. ( )

4. A triangle can have at most one obtuse angle ( )

Knowledge of triangles

Definition: A figure surrounded by three line segments is called a triangle.

Features: A triangle has 3 sides, 3 angles, and 3 vertices.

Features: Stability

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"Skillful Little Craftsman" PPT courseware 6:

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 2 industry PPT template

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