How to calculate the land area and how to calculate it

Long by wide

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1. How to calculate the land area, how many square meters is an acre of land
2. The magnification of a microscope refers to the magnification of the length or width of an object, not the area or volume
3. Magnification: the magnification of a microscope is equal to the product of -- and -- magnification, which enlarges the length or width of an object
4. What is the magnification of microscope? Is it the multiple of length or area? Or what does it mean? If a carbon particle is magnified 600 times under a microscope, what does it mean?
5. North Korea's land area is equivalent to China's which city
6. Which province has the largest land area in China? Note: it's land area, not land area. I know it's Xinjiang
7. China's total land area
8. What are the units of area and length in letters?
9. A cuboid freezer, measuring 90cm, 50cm wide and 50cm deep from inside. What is its volume cubic decimeter
10. The volume of the refrigerator freezer is 60 liters (60 cubic decimeters). The length of the freezer is 40 cm, the width is 25 cm, and how high is it? (list the formula)
11. Why does the magnification of a microscope not refer to the area of the magnified image?
12. Ordinary optical microscope is often used in biological experiments. If a small object is magnified 50 times by the microscope, "magnified 50 times" here refers to () A. Volume B. surface area C. image area D. length and width
13. Why, under a microscope, is magnification the length and width of an object? Not area, volume Under a microscope, what is magnified is length or width. Why not area or volume?
14. To observe the cell with microscope, is the cell area enlarged or the cell length enlarged? For example, if the magnification of a microscope is 40 times, do you want to enlarge the length 40 times or the area 40 times?
15. Does a microscope magnify length, area, or volume?
16. Does the microscope magnify the length or the area? Eyepiece 10x objective 40x And then we zoom in
17. Is magnification of microscope line length or area?
18. The aircraft takes off at a constant acceleration on the runway. The taxiing time is 20 seconds and the taxiing distance is 1200 meters. The acceleration of the aircraft is calculated
19. When an aircraft takes off, the speed should reach 216KM / h, and the aircraft starts to taxi with uniform acceleration from standstill. The acceleration is 2m / S2, and the runway of the airport should at least When an aircraft takes off at a speed of 216KM / h, the aircraft begins to taxi with constant acceleration from standstill, and the acceleration is 2m / S2. How long is the runway of the airport at least to take off safely?
20. The speed of an airplane is 216KM / h when it lands. After landing, it moves in a straight line with an acceleration of 6m / S ^ 2 The speed of an aircraft when landing is 216KM / h. After landing, it will make a uniform deceleration linear motion with an acceleration of 6m / S ^ 2. (1) the speed when it taxis 225m after landing, and the displacement when it taxis within 12s after landing