Use 3 squares with sides of 2 decimeters to form a rectangle, and what is the circumference of the r

The circumference of the rectangle is 16 decimeters.

The process is as follows:

1) Use 3 squares with a side length of 2 decimeters to form a rectangle, as shown in the figure below

2) Because it is three squares with a side length of 2 decimeters, whether it is horizontal or vertical, the length of the resulting rectangle is 2 + 2 + 2 = 6 decimeters. The width is 2 decimeters.

3) According to the formula for calculating the perimeter of the rectangle, the circumference of the rectangle = 2 (length + width) = 2 (6 + 2) = 16 decimeters.

The length of the rectangle is: 2 3 = 6 decimeters Circumference: (6 + 2) 2 = 8 2 = 16 square decimeters.

The formula for the circumference of a rectangle = (length + width) 2

c=2(a+b)

Related teaching. The definition of the perimeter of a rectangle is based on the students' initial understanding of the rectangle. When teaching, we should be good at guiding students to observe, summarize and summarize, so as to cultivate students' abilities.

In teaching, the teacher can show a model of a rectangle for students to observe and ask: How many sides does this rectangle have? How many corners?

What does it have to do with the opposite side? Through the visual demonstration, students will observe and conclude that there is a rectangle with 4 sides and 4 corners, and the opposite sides are equal. Then, the teacher uses a string to circle the four sides of the rectangle, guides the students to observe, and then asks one student to demonstrate, so as to conclude that the definition of the perimeter of the rectangle is the length of the circumference around the rectangle.

In this way, through the teacher's operation and inspiration, the students' understanding of the definition is deepened, and the students' ability to observe, summarize and summarize is cultivated.

The formula for calculating the perimeter of a rectangle is the focus of this lesson, and the teacher should focus on it. Students should not only memorize the content of the formula, but also know how it was derived. Such as:

When teaching the formula for calculating the perimeter of a rectangle, the teacher can first show the model enclosed by iron wire, guide the students to recall the definition, and conclude that the perimeter of the rectangle is the length of the iron wire, and then the teacher will use the iron wire to inspire the students to derive the formula according to the teacher's demonstration: the perimeter of the rectangle = length + width + length + width. On this basis, the model is presented to inspire students to find out the rules by observing and combining the equations to find out the rules, so as to derive the formula for the perimeter of the rectangle:

Length + Width) x2. In this way, students can improve their analytical skills in the process of deriving formulas.

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Answer: The circumference is 18 decimeters.

Solution: The rectangle is 3 2 6 decimeters long.

Width 3 dm, circumference (length and width) 2

Chao Zheng 6 3) 2

18 decimeters.

Summary. Use 3 squares with sides of 1 decimeter to form a rectangle, and the circumference of this rectangle is how many decimeters.

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Pro, use 3 squares with a side length of 1 decimeter to form a rectangle, indicating that the length of the rectangle is 1 + 1 + 1 = 3 decimeters, and the width is 1 decimeter. The circumference of the square = (length + width) 2 (3 + 1) 2 = 8 decimeters.

Good. Do you understand?

Because three squares can only be put together in a rectangle, so:

Circumference = 2 (2 + 3 2) = 16 cm.

The length of this rectangle is 3 2 = 6 (decimeter, width is 3 decimeter, and circumference is.

6+3) 2=18 (decimeters).

Or so it goes:

It turns out that the circumference of the square is 3 4 = 12 (decimeters), and the two squares are put together into a rectangle, and two sides are put together inside. So, the circumference of the rectangle is.

18 decimeters.

3 6 = 18 (decimeters).

18 decimeters = meters.

Answer: The circumference of this rectangle is meters.

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Combine two squares with sides of 10 cm into a rectangle, the circumference of this rectangle is (60 cm, and the area is (200 square cm.

Centimeter 10 10 2

200 square centimeters.

2+2=4 (decimeter);

The width is 2 decimeters;

The circumference is: (4+2) 2,6 2,12 (dm).

120 cm

A: The circumference of this rectangle is 120 cm

Two squares with sides of 2 decimeters are put together to form a rectangle, and the length of the new rectangle is: 2+2=4 (decimeters); The width is 2 decimeters; The circumference is: (4+2) 2, =6 2, =12(decimeter) =120 cm A:

The circumference of this rectangle is 120 centimeters

Hello, put together two squares with sides of 2 decimeters into a rectangle, the circumference of this rectangle is (12) decimeters, and the area is (8) square decimeters.