A circle is divided into several parts along the radius to form an approximate rectangle. The circumference of the rectangle is 4cm more than the circumference of the circle. What is the circumference of the circle and its area

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• 1. How to find the maximum value of sine function
• 2. As shown in the figure, a circular shear is put together into an approximate rectangle. Given that the perimeter of the rectangle is 33.12 cm, what is the area of the shadow in square centimeter? It's better to make the details clear,
• 3. What is the root of x ^ 3 + lgx = 18
• 4. There are two squares of different sizes. The difference in circumference is 20cm and the difference in area is 75cm. What is the area of the big square?
• 5. Let the population x obey the normal distribution n (μ, σ ^ 2), x1, X2,..., xn be a sample from the population, let u = n ^ (1 / 2) * (x ˉ - μ) / σ, then d (U) =? Ask for detailed explanation
• 6. A classroom is 8 meters long and 6 meters wide. How many decimeters long square tiles are used to lay the floor? How many tiles do you need?
• 7. (1).x^2+1=2x (2) In factorization, when x ^ 2 + ax + B, Xiaomin misinterprets B, the result of factorization is (x + 2) (x + 4), XiaoCong misinterprets a, the result of factorization is (x + 1) (x + 9), find the value of a and B, and write the correct process of factorization
• 8. 6.4 factorization of the simple application of the exercise book, soon! (x^2y-xy^2)÷(x-y)= (a^2-9)÷(a+3)= (m^2+2mn+n^2)÷(m+n)= Calculation (4x ^ 2-4x + 1) / (1-2x)= A.2x+1 B.2x-1 C.1-2x D.-1-2x calculation: (a^2-64)÷(a-8) (3x^3y^2+6x^2y^3)÷(x+2y) (-9m^2+4n^2)÷(3m+2n) Solve the following equation: (process complete) x^2+2x=0 9x^2-4=0 calculation: (4a^2-20ab+25b^2)÷(5b-2a) (1-16a^4)÷(4a^2+1)÷(2a+1) solve equations: -1/2x^2+2x=0 (3a-4)^2=25 Right away,
• 9. Decomposition of force Two points AB on two vertical wooden poles are equal in height. A smooth light rope is tied at two points ab. a hook is hung on the rope in the middle and a heavy object is tied below. Now, raise the right rope end from point B along the pole to point B '(the rope length is greater than the distance between ab'), and the tension of the light rope between two points ab 'will remain unchanged compared with before moving. Why remain unchanged? Why is the rope length greater than the distance between ab'?
• 10. Decomposition method and principle of force
• 11. Some problems about potential energy 1. What is the relationship between elastic potential energy and elasticity? Is it the same? I think there is something wrong with the topic of gravitational potential energy in the book The following objects have gravitational potential energy () A. Spring tightened in mechanical watch B. Ships on the sea C. Stones still on the top of the mountain D. A car running on level ground The answer is C. explain. If you think the question is wrong or choose another answer, explain why If you think the answer is correct, look at the following questions: For example, on the Qinghai Tibet Plateau and the North China Plain, there are the same flat sand mounds, and there are also the same stones falling from the sand mounds 5 meters away, and each of them smashes a sand pit. Are the depths of the two sand pits different? (regardless of wind and other conditions)
• 12. Take a 2cm rectangular iron sheet from the square iron sheet, and the area of the remaining iron sheet is 48CM. What is the perimeter of the original square?
• 13. The radius of a circle is 3cm. To increase the area of the circle by 21.98cm, what is the radius of the increased circle?
• 14. 1. What is the area of a circle with a circumference of 6 π? 2. If the area of a circle is 4 π square meters, how many meters is its diameter? Tonight!
• 15. Urgent, a mathematical problem Chen Bin, a student of Zhenhua primary school, and his parents are going to travel on the national day. The charge standard of Chunqiu travel agency is: full price for adults and half price for children. Huaxia travel agency, regardless of adults and children, is 20% off. If the basic price of the two travel agencies is the same, which travel agency do you think Chen Bin chooses is more cost-effective
• 16. It is known that the quadrilateral ABCD is a parallelogram, and the diagonal lines AC and BD intersect at point O. it is known that the perimeter of the parallelogram is 48 cm, The perimeter of triangle cod is 4cm longer than that of triangle AOD, so the length of AB and ad can be calculated
• 17. An original article has 15 pages, 24 lines on each page, 25 words on each line. If it is changed to 30 words on each line, 30 lines on each page, then how many pages should the article be arranged?
• 18. In rectangular ABCD, ad = 30, ab = 20, e, f are divided into three equal diagonal lines, AC, then the area of △ FBE is equal to]
• 19. The taxi charge standard of a certain place is: the starting price is 4 yuan, you can take 3 km, 3 km to 5 km, 1.2 yuan per km; after 5 km, 2 yuan per km, if someone takes x (x > 5) km road, please write down the cost he pays; if he pays 10.4 yuan, can you calculate the distance he takes? (Note: KM is km)
• 20. In trapezoidal ABCD, ad ‖ BC (AD > BC), Mn is the midpoint of two waist AB, CD, me ‖ an, judge the number and position of AM and ne 22： Go to the space of 470783401 to see the picture AD＜BC