1, the first formula is area = base x height /2. This formula is mainly used when the base and height of a triangle are known, and the area can be obtained by multiplying the base and height by 2. This formula is derived from the area formula of parallelogram, because triangle can be regarded as half of parallelogram, so the area is half of base and height.

2. The second formula is area = 1/2x, and radix x is high. This formula is also applicable to the case where the base and height of a triangle are known, but it is more commonly used than the first formula because it can easily balance and simplify the formula. This formula is derived from the area formula of rectangle, because the triangle can be regarded as half of the rectangle, so the area is 65438+ 0/2 of the base and height.

3. There is also a formula to calculate the area of isosceles triangle: area = 1/2x base x height. Because the two base angles of an isosceles triangle are equal, its area is 1/2. These formulas are based on the basic knowledge of plane geometry, and the area of a triangle can be obtained by knowing the base and height of the triangle or the length of two sides and an included angle. These formulas are also one of the most important basic skills in mathematics and are very important knowledge points for students.

The importance of learning mathematics;

1. Problem solving: Mathematics is the basis for solving various practical problems. From shopping and calculating interest rate in daily life to measurement and data analysis in science, engineering, medicine and other fields, it is inseparable from the support of mathematics. Mastering mathematical knowledge and skills is very important for effectively solving practical problems.

2. Cultivate thinking ability: Learning mathematics can cultivate people's logical reasoning ability, abstract thinking ability and creative thinking ability. By analyzing problems, deducing conclusions and verifying answers, people can better understand and solve various complex problems.

3. Decision and forecast: Mathematics plays an important role in the fields of economy, finance and statistics. Through mathematical analysis, we can better understand economic laws, make investment decisions and predict market trends.

4. Scientific research innovation: Mathematics is the foundation of scientific research, and many major inventions and breakthroughs are inseparable from the support of mathematics. At the same time, mathematics is also the cornerstone of computer science, physics, engineering and other fields, which provides a powerful tool for scientific and technological innovation.

5. Improve the quality of life: By studying mathematics, people can better understand various phenomena in technology, society and life and make more informed decisions. For example, knowledge of mathematics can help people manage their personal finances better and choose the appropriate health care plan.