Solve for circumference

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Solving for circumference

Correctly distinguish the significance of the perimeter and area of a rectangle and a square, and correctly use the above four calculation formulas to find the perimeter and area. Classification: what kind of problem is perimeter? (sewing lace, fencing, fence pole, length of the path around the pond or flower bed, length of running around the playground, etc.) what kind of problem is to seek the area? Or is it related to area? (cover size of textbooks, wall painting, area of the path around the flower bed, glass for the dining table, tablecloth for the desk, floor sprinkled by the sprinkler, floor area of an item, glass, mirror, cloth, carpet, floor covering, handkerchief cutting, etc.) Student 2: I didn't understand why the sum of length and width should be multiplied by 2 to find the perimeter of a rectangle. Now I know that this is a simple algorithm to find the sum of the four sides. Learning notes series: floating point integer assignment operator example: Notes for compound assignment operator + +, -- operator meaning: calculate the area and perimeter, calculate the average score of the exam, and calculate the number of seconds in a week Common examination questions: ① know the bottom area and height of the cone, and find the volume and bottom perimeter; ② know the bottom perimeter and height of the cone, and find the volume and bottom area of the cone; ③ know the bottom perimeter and volume of the cone, and find the height and bottom area of the cone. The solution to the above common questions is usually to find the bottom radius and height of the cone, and then calculate according to the relevant calculation formula of the cylinder 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 tenth question of the blank filling question is what is the side length and area of a square with a circumference of 36? If there is no first question, this question is even a slightly difficult one. That is to say, when there is no second question, a small number of children will directly use the perimeter to multiply the perimeter to find the area. In fact, this kind of problem is nothing more than careless examination. Common questions in the examination: ① know the bottom area and height of the cylinder, find the side area, surface area, volume and bottom perimeter of the cylinder ② know the bottom perimeter and height of the cylinder, find the side area, surface area, volume and bottom area of the cylinder ③ know the bottom perimeter and volume of the cylinder, find the side area, surface area, height and bottom area of the circular column ④ know the bottom area and height of the cylinder, find the side area and surface area of the cylinder, Volume ⑤ given the side area and height of the cylinder, find the bottom radius, surface area, volume and bottom area of the cylinder [warm tip] judge the conditions for forming a triangle: given the length of three line segments, as long as the sum of the shorter two line segments is greater than the length of the third line segment, it can be judged that it can form a triangle; When the given ranges of the two sides and the third side are known to calculate the perimeter of a triangle, we must first judge whether it can form a triangle by using the trilateral relationship, and then calculate it First, the relationship among the three sides of a triangle. The most important property of the relationship between the three sides of a triangle is that the sum of the two sides is greater than the third side, and the difference between the two sides is less than the third side. This is an important judgment on whether the three sides of a triangle can form a triangle. In the actual application process, instead of directly determining whether a triangle can be formed, we seek the range of the third side, the relationship between the longest side, the shortest side and the perimeter, and so on. These are the actual inspection methods and corresponding questions for this test point.

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