How to solve circumference

Are you trying to learn how to solve circumference? If so, you have come to the right place.

How can we solve circumference

For general triangles, it may not work from the perspective of equations. Area and perimeter are only two equations, but the lengths of the three sides are three unknowns. Here, the number of equations is smaller than the number of unknowns, so it may not be able to solve. (unless some very ingenious figures can just achieve multiple formulations within a formula) Type V, the transformation of perimeter problem is based on the property of angular bisector. Among the problems of triangles, the problem of finding the perimeter of a triangle usually occurs. When such problems occur, the focus of attention is to find the perimeter of a triangle by using the known length of line segments through conditional transformation, rather than directly finding the three sides of the triangle. Then add these three line segments to get the perimeter of the triangle. Therefore, this method of auxiliary line is to solve the solution point by transferring the form of line segments and changing the perimeter into the length of known line segments, which will make the whole solution process more convenient. The thinking and skills of solving the problem are also very simple. We can use the relationship of the three sides of a triangle. The sum of any two sides is greater than the third side, and the difference between any two sides is less than the third side. This relationship can solve that the range of the third side is in the middle of the known difference between the two sides and the sum of the two sides. After obtaining this range, we should also pay attention that the two sides of this range cannot take equal signs. Through the relationship of this layer, the relationship between the longest side, the shortest side or the perimeter of the triangle can be solved. The problem of spherical cross-section in solid geometry is a hot and difficult point in the mathematics college entrance examination. Examinees often cannot abstract the shape and characteristics of the cross-section, which brings great difficulties in finding the perimeter, area and maximum value of the cross-section. This lesson discusses effective solutions to such problems. Please refer to them for reference. In the whole known condition, the side length of a large square can be found to be 20 through the area of a large square, but the perimeter of four rectangles is unknown. However, since the side lengths of different rectangles are all within the side length of a large square, and the product of the side lengths is equal to the area of the rectangle. Therefore, the first idea is to set several side lengths as unknowns and solve the side lengths of the shaded part by equations. Analysis: because the volume is related to the height and the bottom radius, it is necessary to derive the relationship between the radius of the cylinder and the radius of the cone by converting the ratio of the perimeter of the bottom, and then use their volume ratios to solve. Optimization problem is a problem that system science attaches great importance to. The understanding of this problem has gone through a long process of occurrence and development, and is constantly applied to practice at the same time. For example, in the process of discussing architecture in ancient Greece, it was found that the best ratio of the length and width of a rectangle, that is, the golden ratio, is still applied today; Archimedes proved that when the perimeter was determined, the area contained in the circle was the largest. This discovery affected the architectural style of ancient European castles, so they almost all adopted circular architecture; In calculus in the 17th century, it was proposed to solve the extreme value problem of functions. Euler tried to express the following belief in mathematical language: everything has relative advantages. The purpose of research is to find such advantages and disadvantages. In many cases, people do not need to compare absolute advantages, but comparative advantages are enough, such as the college entrance examination and the scoring system of grade four and six. I will skip a paragraph here. At that time, I only noticed dovydov's algebra book, which cleverly used elementary methods (that is, without calculus) to solve the maximum and minimum problems. For example, it is known that the sum of positive numbers a and B is a constant value, and the maximum value of its product AB is obtained; Given the perimeter of the rectangle, find the maximum value of its area; Given a square, if four small squares are cut off from the four corners of the square and the rest are made into a box, what size of small square should be cut off to maximize the volume of the box?

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