"Busy Construction Site" PPT courseware

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"Busy Construction Site" PPT courseware

What is a triangle?

A figure surrounded by three line segments is called a triangle

A triangle has three sides, three vertices, and three angles.

who to judge

Which of the following shapes are triangles? Which ones are not? Please explain why.

Take a look:

Examples of triangles in daily life

Based on the triangle you made, compare the lengths of these three small rods. What do you find?

6cm+5cm＞10cm 4cm+5cm＞6cm

6cm+4cm=10cm 5cm+4cm＜10cm

The sum of any two sides of a triangle is greater than the third side.

Please verify using your preferred method:

Is the sum of the interior angles of a triangle 180 degrees?

A right triangle, one acute angle is 50°, what is the other acute angle?

180°-90°-50°=40°

180°-(50°+90°)=40°

90°－50°＝40°

It is known that an isosceles triangle kite has a base angle of 70°, and what is the vertex angle?

180°-70°-70°=40°

180°－70°×2=40°

sublimation of knowledge

For the regular hexagon below, can you find the sum of the interior angles of the hexagon based on the knowledge you have learned? What about the heptagon? …

4 triangles: 180° × 4 = 720°

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"Busy Construction Site" PPT Courseware 4:

"Busy Construction Site" PPT Courseware 4 1. The figure formed by two rays drawn from a point is called an angle. How are these three corners drawn? Draw a point first, and then draw two rays. 2. Names of each part of the angle and how to express the angle. Angle is usually represented by the symbol , ..

"Busy Construction Site" PPT courseware 3:

"Busy Construction Site" PPT courseware 3 1. Situation introduction The surface area of ​​the entire Water Cube building reaches 100,000 square meters. The surface of the entire Water Cube building is covered with air pillows, covering an area of ​​100,000 square meters, making it the largest in the world. Based on this information, what can you suggest...

"Busy Construction Site" PPT Courseware 2:

"Busy Construction Site" PPT courseware 2 Learning objectives: 1. Understand angles and master the classification of acute angles, right angles, obtuse angles, straight angles and circumferential angles. And know the relationship between right angles, square angles and circumferential angles. 2. Be able to use a protractor to measure angles. 3. Be able to use a protractor to draw angles of specified degrees..

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Update Time: 2024-11-19

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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