"Area of ​​Trapezoid" Area of ​​Polygon PPT Courseware 3

Description

"Area of ​​Trapezoid" Area of ​​Polygon PPT Courseware 3

teaching objectives

1. Knowledge objectives: Understand and master the formula for calculating the area of ​​a trapezoid, and be able to correctly apply the formula for calculation.

2. Ability goal: Through operations, cultivate everyone’s ability to transfer analogies and abstract generalizations.

3. Emotional goals: Cultivate everyone’s ability to apply learned knowledge to solve practical problems and develop spatial concepts.

think:

1. What is the relationship between the base of a parallelogram and the base of a trapezoid?

Answer: The base of the parallelogram is equal to the sum of the upper and lower bases of the trapezoid.

2. What is the relationship between the height of the parallelogram and the height of the trapezoid?

Answer: The height of the parallelogram is equal to the height of the trapezoid.

There is a dam with a trapezoidal cross-section. The length of the top of the dam is 20 meters, the length of the bottom of the dam is 80 meters, and the height of the dam is 40 meters. What is the cross-sectional area of ​​the embankment in square meters?

S ladder = ( a + b ) h ÷ 2

(20 +80)×40÷2

=100×40÷2

=4000÷2

=2000(square meters)

Multiple choice questions

1. The area of ​​a trapezoid is 20 square meters, and the area of ​​a parallelogram with the same base and height as it is ( ) square meters.

A.10 B.20 C.40

2. Two trapezoids and parallelograms with equal bases and equal heights. If the area of ​​the parallelogram is 10 square meters, then the area of ​​the trapezoid is ( ) square meters.

A.5 B.10 C.20

Thinking questions

1. Use only one cut to cut the trapezoid into a triangle and a trapezoid.

2. Use only one cut to cut the trapezoid into a parallelogram and a trapezoid.

3. Cut only one knife and cut the trapezoid into two trapezoids.

4. Cut only one knife and cut the trapezoid into two triangles.

Summary of this lesson

Understand and master the formula for calculating the area of ​​a trapezoid and be able to correctly apply the formula for calculation.

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For more information about the "Area of ​​Polygons and Areas of Trapezoides" PPT courseware, please click the Area of ​​Polygons ppt Area of ​​Trapezoid ppt tag.

"Area of ​​Trapezoid" Area of ​​Polygon Flash Animation Courseware 4:

"The Area of ​​a Trapezoid" The Area of ​​a Polygon Flash Animation Courseware 4 This courseware is a teaching material for the fifth unit of the fifth grade mathematics volume of the Hebei Education Edition The Area of ​​a Polygon The Area of ​​a Trapezoid Flash Animation Courseware The content is vivid and vivid, please download it! Keywords: Polygonal faces..

"Area of ​​Trapezoid" Area of ​​Polygon Flash Animation Courseware 3:

"The Area of ​​a Trapezoid" The Area of ​​a Polygon Flash Animation Courseware 3 This courseware is a teaching material for the fifth unit of the fifth grade mathematics volume of the Hebei Education Edition The Area of ​​a Polygon The Area of ​​a Trapezoid Flash Animation Courseware The content is vivid and vivid, please download it! Keywords: Polygonal faces..

"Area of ​​Trapezoid" Area of ​​Polygon PPT Courseware 2:

"Area of ​​Trapezoid" Area of ​​Polygon PPT Courseware 2 Look at the picture and think about the questions 1. Can you use the skills you have learned to find a way to find the area of ​​the trapezoid? 2. If you can’t think of a way by looking at the picture, can you think of a way to find the area of ​​a trapezoid by using the learning tools in your hand? ..

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 1 industry PPT template

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