Example 1: A triangular nursery with a bottom length of 80m and a height of 35m is planted with chrysanthemum seedlings. Each chrysanthemum seedling covers an area of 0.2m2 How many chrysanthemum seedlings does this garden need?

Example 2: Trapezoidal fence surrounded by walls. The fence is 40 meters long. How many square meters is its area?

Example 3: The base and height of triangle and parallelogram are equal. If the area of parallelogram is 128 square meters, what is the area of triangle?

Example 4: What is the area of a trapezoid with an upper bottom of 3.4 cm, a lower bottom of 4.8 cm and a height of 2.7 cm?

Example 5: The base of a parallelogram is 2.4 decimeters, and the height is half of the base. What is its area?

Example 6: The area of parallelogram is 9 square decimeters, the base is enlarged by 4 times, and the height remains unchanged. How many square decimetres is its area?

The area of the combined graph is 1. Segmentation is to divide a combined graph into several simple regular graphs according to its characteristics and known conditions, calculate the area of each graph respectively, and finally calculate the sum of their areas. 2. Rotate the original graph one or more times to make it a familiar new graph, and then calculate it.

The area of combined graphics is the content of Unit 5 in the first volume of the fifth grade primary school mathematics of Beijing Normal University. Learning the area of combined graphics is a kind of learning from image to abstraction after learning the area formulas of five basic graphics: rectangle, square, parallelogram, triangle and trapezoid. The basic method to solve the problem is to convert the combination diagram into the basic diagram and then calculate it.

Refer to the above content: Baidu Encyclopedia-the field of combined graphics