Four conclusions of the bird's head model: in a triangle, the area ratio of two triangles with the same angle is equal to the ratio of the products of two sides with the same angle.

Bird's head model is the content of primary school Olympic Games, which aims to solve the problem of finding triangle area in plane triangle. In addition to the conventional cardinal number multiplied by the height divided by two, the area ratio can also be calculated according to the side length ratio through the bird head model.

Bird's head model is one of the five geometric models, which is applied to plane geometric problems. If one angle of two triangles is equal or complementary, then these two triangles are called * * * angle triangles. The definition of bird head model is that the area ratio of * * * triangle is equal to the ratio of the product of two sides of the corresponding angle.

For teachers, establishing bird head model can further improve teaching plans, expand students' knowledge and broaden students' thinking. When establishing the bird's head model, exercises can be added appropriately to help students better master the application of this formula.

For students, there must be some misunderstandings about the beginner's bird head model. You can build a * * * triangle to verify the correctness of the definition of bird head, which not only solves your own doubts but also deepens your understanding of the formula, killing two birds with one stone.

Steps to solve problems by using bird head model

Step 1: Observation: See if there is a bird head model in the picture.

Step 2: Construction: By adding auxiliary lines to construct equal angles or complementary angles, the bird head model is established.

Step 3: Assumption: According to the requirements of the topic, assume the required line segment length or graphic area.

Step 4: Conversion: Convert the assumed unknowns into the proportional relationship of the bird's head model for calculation.