Intelligent network:

The formula for calculating the trapezoidal area in 1. letters is ()

2, 2.65 square meters = () square decimeter 3600 square meters = () hectares.

3. A parallelogram with a base of 1.2m and a height of 0.8m The area of a triangle with equal base and equal height is () m2.

4. The upper bottom of trapezoid is enlarged by 2 times, and the lower bottom is also enlarged by 2 times. If the height remains the same, its area will expand () times.

5. The triangle has an area of 32m2, a height of 4m and a base of ().

6. Judges. (The "√" in brackets is correct, and the "×" in brackets is wrong)

(1) Two triangles with the same base and height may not have the same shape, but their areas must be equal. ( )

(2) The area of parallelogram is twice that of triangle. ( )

(3) The area of a right triangle is equal to the product of two right-angled side lengths divided by 2. ( )

(4) The perimeters of the two gardens are equal, and their areas must be equal. ( )

Step 7 choose. (Fill in the serial number of the correct answer in brackets)

The height and area of the (1) triangle are equal to the parallelogram, and the base of the parallelogram is 15cm, and the base of the triangle is () cm.

① 10 ② 15 ③30 ④20

(2) It is known that the trapezoid has an area of 42.5dm2, an upper bottom of 3dm, a lower bottom of 7dm and a height of ().

①42.5×2÷(3+7) ② 42.5÷(3+7) ③42.5÷(3+7-3)

(3) The basketball court covers an area of 0.63 ()

① hectares ② square meters ③ meters ④ square kilometers

(4) If the base and height of a parallelogram are divided by 2, its area is 2 times smaller (①), ② 4 times larger and ③ 4 times smaller than the original one.

8. Calculate the area of the following figure: (unit: cm)

Online application:

1. There is a trapezoidal wheat field with an upper bottom of 28 meters, a lower bottom of 32 meters and a height of 20 meters. In this field, * * * harvested 30 1.2 kilograms of wheat, how many kilograms of wheat per square meter on average?

2. The original playground of a school covers an area of 2800m2. Due to the expansion, the width is increased from 40 meters to 50 meters, and the length remains unchanged. How much m2 does the expanded playground area increase compared with the original one?

Third, the practice platform.

Find the area of the combination diagram: (unit: meter)

Four, intellectual surfing (5 points)

18, there is a parallelogram vegetable field (as shown in the figure), with DE=EF=FC, GB= 1/3BD, and triangular GEF planted Chinese cabbage with an area of 8 m2. What is the area of this parallelogram vegetable field?

A b

This is just one of them, and some graphics can't be displayed because of plagiarism. I suggest you look at them yourself. /list/list 10_9_6.html is downloaded for free, and I often use the information here.