"Surface Area of Rectangles and Squares" PPT

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Hebei Education Edition Fifth Grade Mathematics Volume 2	pptx	6 MB

"Surface Area of Rectangles and Squares" PPT

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Upload Time: 2024-10-02

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"Surface Area of Rectangles and Squares" PPT

Part One: Analysis of Examples

Example 5. Congcong made a rectangular gift box by himself (as shown below). He wanted to paste beautiful colored paper on the surface of the box. How much colored paper is needed at least? (Unit: cm)

To find how much colored paper is needed, you need to find the total area of the six sides of the paper box.

The total area of the upper and lower surfaces: 24×15×2=720 (square centimeters)

The total area of the front and back surfaces: 24×12×2=576 (square centimeters)

The total area of the left and right sides: 12×15×2=360 (square centimeters)

The total area of the six faces: 720+576+360=1656 (square centimeters)

(24×15+24×12+12×15)×2

=828×2

=1656 (square centimeters)

Answer: At least ( ) square centimeters of colored paper is required.

Surface area of rectangles and squares PPT, Part 2: Classroom exercises

How many square meters of cardboard should be used to make a microwave oven packaging box (as shown on the right)?

What is required here is the surface area of the rectangular box.

Each upper and lower side has a length of _____ and a width of _____, and its area is ______;

Each side of the front and back is _____ long, _____ wide, and the area is ______;

Each of the left and right sides is _____ long, _____ wide, and has an area of ______.

The surface area of this box is:

0.35×2 + 0.28×2 + 0.2×2

=0.7 + 0.56 + 0.4

=1.66(m2)

Answer: Use at least 1.66 m2 of cardboard.

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For more information about the PPT courseware "Surface Areas of Rectangles and Squares of Cuboids and Cubes", please click on the Surface Areas of Rectangles and Squares ppt ppt tab of Cuboids and Cubes.

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Update Time: 2024-10-02

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"Surface Area of Rectangles and Squares" PPT