"Polygons in Life" PPT Courseware 2

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"Polygons in Life" PPT Courseware 2

Area of ​​rectangle = length x width

Area of ​​a square = length of side x length of side

What is a parallelogram? Indicate its base and height.

Characteristics of parallelograms

① Opposite sides are parallel and equal

②Diagonal angles are equal

Calculation of area of ​​parallelogram

Through experiments, we can see that we can convert a parallelogram into a rectangle. Its area is the same as the original parallelogram.

The length of this rectangle is equal to the base of the original parallelogram ( )

The width of this rectangle is equal to the height of the original parallelogram ( )

judge and give reasons

(1) If the heights of two parallelograms are equal, their areas are equal ( ).

(2) The longer the base of a parallelogram, the greater its area ( ).

Standard practice questions

1. Fill in the blanks

(1) Convert a parallelogram into a rectangle whose area is the same as the original parallelogram ( ). The length of this rectangle is equal to the base of the parallelogram ( ), and its width is equal to the height of the parallelogram ( ). The area of ​​a parallelogram is equal to ( ), represented by letters ( ).

(2) 0.85 hectares = ( ) square meters

0.56 square kilometers = ( ) hectares

86,000 square meters = ( ) hectare

9.28 square meters = ( ) square decimeters = ( ) square centimeters

2. Application questions

(1) A parallelogram steel plate has a base of 8.5m and a height of 6m. What is its area? If the steel plate weighs 38 kilograms per square meter, how many kilograms does this steel plate weigh?

(2) There is a parallelogram grassland with a base length of 25m and a height that is half of the base. If each square meter of grass can feed 3 sheep for one day, how many sheep can feed this piece of grass for one day?

(3) A piece of parallel four-sided land has a base length of 150m and a height of 80m. How many hectares does this land have? A total of 7680 kilograms of wheat were harvested from this field. How many kilograms of wheat were harvested per hectare on average?

practice

1. Fill in the blanks.

(1) The base of a parallelogram is 9 centimeters, the height is 3 decimeters, and its area is () square centimeters.

(2) The area of ​​a parallelogram is 30 square meters, the height is 6 meters, and the base is () meters.

2. Judgment. (Tick “√” if the answer is correct and “×” if the answer is wrong)

(1) The area of ​​a parallelogram is multiplied by its height multiplied by its corresponding base. ( )

(2) The area of ​​the parallelogram is equal to the area of ​​the rectangle. ( )

3. Choose. (Put the correct answer number in brackets)

(1) The area of ​​the lower right picture is: (　)

A.5×2＝10

B.5×2=10 meters

C.5×2=10 (square meters)

(2) Area of ​​two figures ( )

A. Not equal

B.Equal

C. May be equal

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Update Time: 2024-10-19

This template belongs to Mathematics courseware Qingdao Edition Fifth Grade Mathematics Volume 1 industry PPT template

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