The surface area of a cube is in direct proportion to its edge length. Why?

Because edge length = surface area: edge length, they are the quantity of two related quantities, so they are in positive proportion

What's the proportion between the area of a face and its surface area of a cube? A positive proportion B inverse proportion C is not proportional

Cube has six sides, surface area = 6 * the area of one side
That is s = 6K
Proportional a

RELATED INFORMATIONS

1. The surface area of a cube is proportional to its edge length. Why
2. The edge length of a cube is a and the volume is a
3. How to judge positive proportion and negative proportion
4. How do you judge whether the two quantities are in direct proportion or in inverse proportion?
5. Judge whether the two quantities of each question are in proportion, and explain the reason (1) The speed of the car is fixed, the distance and the time it takes (2) A rectangle has a certain length, an area and a certain width (3) The weight of a bag of rice must be the weight of the food and the rest (4) The number of hectare sown per day is fixed, the total hectare sown and the number of days sown (5) The number of each exercise book is fixed, the total number of bound exercise books and the number of bound exercise books Remember to explain why!
6. Judge whether the two quantities in each question are in proportion, and explain the reason (1) The unit price of the pencil is fixed, the number of pencils to buy and the amount of money to pay (2) The speed of the car is fixed, the driving time is long and the distance is long (3) Perimeter and side length of a square (4) A book, the number of pages read and the number of pages not read
7. A model a car is 150000 yuan per car, B model car is 100000 yuan per car, a model a car can make 8 & nbsp; 000 yuan, and a model B car can make 5 & nbsp; 000 yuan. A company bought 30 models a and B cars with 4 million yuan, and the total profit is no less than 204000 yuan after all of them were sold? How many ten thousand yuan are the profits of these schemes?
8. What's the formula (1) Vega's speed is 14 kilometers per second, which is equivalent to 7 / 13 of Altair's speed. How many kilometers per second is Altair's speed? (2) Vega's speed is 14 kilometers per second, which is equivalent to 6 / 13 of Altair's speed. How many kilometers per second is Altair's speed?
9. Sixth grade students line up to do radio exercises. The number of people in each line is proportional to the number of lines______ When the oil yield is constant, the quality of peanut oil is equal to that of peanut______ Proportion
10. The number of trees in each row is inversely proportional to the number of rows. The number of boys is inversely proportional to the number of girls
11. The volume of a cube is not proportional to its surface area Judgment questions It's a judgment question,
12. The numerator is proportional to the denominator and the denominator is proportional to the fraction
13. If the denominator is fixed, the proportion between the numerator and the fractional value depends on the quantitative relationship
14. When are fractional values, numerators, and denominators in positive proportion
15. A pile of coal carries 25 tons, which is just five twelfth of the total tons. If it carries 60% of the total tons, how many tons?
16. A ton of coal carries 25 tons, which is just five twelfth of the total tons. If it carries 60% of the total tons, how many tons?
17. If the engine power is kept unchanged, the speed of the car is v2 What is the maximum speed of the car on the horizontal road with the same amount of power (assuming that the resistance of the car is the same in three cases)?
18. 1. On the slope with a sine value of 1 / 10, a car runs with constant power, and the friction resistance is 2 / 10 of the weight of the car. If the speed rate of the car going up the slope at a constant speed is V, what is the speed rate of the car going down the slope at a constant speed? 2. The vehicle accelerates on the horizontal road with constant power and constant resistance. When the speed is V, the acceleration is a, and when the speed is 2V, the acceleration is a / 4, what is the maximum speed of the vehicle?
19. When the vehicle runs at a constant speed V, the power of the engine is p. if the resistance of the vehicle in motion is equal to What is the power of the engine when the car is running at 2V?
20. 1、 Judge whether the two quantities in the following questions are in proportion, and explain the reasons. (1) the driving time of the car is fixed, the driving distance and speed 1、 Judge whether the two quantities in the following questions are in proportion, and explain the reasons (1) The time, distance and speed of a car are fixed (2) The amount of money and stops needed to buy a ticket on a bus (3) The price of each TV set is fixed, the number of TV sets to buy and the amount of money 2、 Use the equation to express the quantitative relationship in the following questions (1) A car can travel 180 km in 3 hours and 300 km in 5 hours (2) A pile of flour, 4 bags of 200kg, 6 bags of 300kg