1, squares and rectangles are figures surrounded by () line segments. They all have () sides and () right angles.

2. Rectangular () is equal and square () is equal.

3. A parallelogram has () sides and () angles.

The circumference of a square is 24 decimeters, and the side length is () decimeters.

5. The circumference of a rectangle is equal to ().

6. The circumference of a square is equal to ().

7. Form a square with a length of12m. The circumference of this square is () meters and the side length is () meters.

2. Right or wrong, mark "√" for the right and "×" for the wrong. (*** 10 point)

1, a quadrilateral with four equilateral sides, it must be a square. ( )

2. You can find the perimeter of a rectangle by knowing its two sides. ( )

3. Two rectangles with equal perimeters must have the same shape and size. ()

The length of a rectangle is longer than its width. ( )

5. Rectangular, square and parallelogram are all figures surrounded by four sides, and they are all quadrilaterals. ( )

Third, fill in the form. (*** 12)

1, rectangle 2, square

long

extensive

bellyband

5 cm

4 cm

8 decimeters

4 decimeters

Side length (cm)

Circumference (cm)

three

eight

Fourth, draw pictures. (***8 points)

(1) Draw the same parallelogram.

(2) Draw a symmetrical parallelogram.

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Fifth, the operation problem. (***8 points)

1. Draw a rectangle with a triangle length of 4cm and width of 3cm, and then calculate its circumference.

Sixth, the application problem. (***28 points)

1. has a rectangle, 5 cm long and 4 cm wide. What's its circumference?

There is a square with a side length of 9 decimeters. What's its circumference?

3. Two squares with a side length of 10 cm form a rectangle (as shown in the figure). What is the circumference of this rectangle?

4. Uncle Li enclosed a rectangular vegetable field with a wall and a bamboo fence (pictured). This vegetable field is 30 meters long and 20 meters wide. Find out the length of the bamboo fence.

Seven, intellectual surfing. (10)

1. After two squares of the same size are combined into a big rectangle (as shown in the figure), the circumference is 40 cm less than the sum of the original two squares. What is the circumference of the original square?