A circle with an area of 314 square decimeters has a radius of______ Decimeter, circumference is______ Decimeter

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• 1. The area of a circle is 314 square centimeters, the circumference is (), the radius is (), and the diameter is () Why? How
• 2. What is the carrying capacity of freight cars multiplied by the number of freight cars needed
• 3. The ratio of walking speed between a and B is 7:5. They set out from a and B at the same time and walk in opposite directions. They met at 0.5 hours The walking speed ratio of a and B is 7:5. They start from a and B at the same time and walk in opposite directions. They meet after 0.5 hours. If they start from a and B at the same time and walk in the same direction (one is in a and the other is in B, but they all face the same direction), how many hours will it take a to catch up with B? There must be process and reason No equations
• 4. There are two baskets of apples. The weight of basket a is 1.8 times that of basket B. If 6 kg is taken out of basket a and put into basket B, the weight of the two baskets is equal, and the weight of basket a and B is the same How many kilos does it weigh?
• 5. If the speed of a car from city a to city B is increased by 20%, it can arrive at city B one hour earlier than the original time; if the speed is increased by 30% after driving 100 km at the original speed, it can arrive at city B one hour earlier than the original time______ Kilometers
• 6. The fast train and the slow train leave each other from a and B. one fifth of the current whole journey of the fast train goes 11 kilometers later, and the slow train leaves. When they meet, the slow train runs the whole journey Two out of seven. The speed ratio of the two cars is 5:4. How many meters is the distance between a and B
• 7. The railway line from Tianjin to Jinan is 360 kilometers long. How many kilometers per hour does the train run on average? (the train from Tianjin to Jinan leaves at 12:30 and arrives at 6:00)
• 8. One ton of coal was transported by car in 8 hours as originally planned. In fact, 1.5 tons more coal was transported per hour than originally planned. In this way, 3 tons more coal was transported in 6 hours than originally planned. How many tons of coal was transported in 8 hours as originally planned?
• 9. A cement plant plans to produce a batch of cement in January. In fact, it has completed one third of the plan in the first ten days, 40% in the middle of the year, and produced again in the last ten days How many million tons are planned to be produced in January? Don't solve the equation!
• 10. In a factory, the ratio of male to female workers was 2:3. After 36 new male workers were transferred, the ratio of male to female workers was 4:5 How many fewer male workers are there than female workers now?
• 11. The area of a circle is 78.5cm-178. How to calculate the diameter, radius and perimeter of a circle
• 12. The sum of the area of a and B circles is 680 square centimeters. The radius ratio of a and B circles is 5:3. What is the area of a square centimeter and that of b square percent The sum of the two circles is 680 square centimeters. The radius ratio of a and B is 5:3. What's the area of a and B
• 13. The area ratio of the two circles is 9:1. The perimeter difference is 12.56 cm. The area difference between the two circles is () square cm
• 14. Area 18.84 the area of a circle is 18.84. Find the radius, diameter and perimeter
• 15. The sum of radius, diameter and perimeter of a circle is 18.56cm. How many square centimeters are left after one fourth of the area of the circle is removed? 30 points is the formula
• 16. The perimeter difference of two circles is 94.2cm. The radius of the big circle is twice the diameter of the small circle. The sum of the areas of the two circles is calculated
• 17. The perimeter difference between the two circles is 94.2cm, and the radius of the big circle is twice the diameter of the small circle
• 18. The radius of the big circle is 6cm, the radius of the small circle is 2cm. The perimeter ratio of the big circle to the small circle is (), and the area ratio of the small circle to the large circle is ()
• 19. The radius of the big circle is twice that of the small circle, the circumference of the big circle is 25.12cm, and the circumference of the small circle is () cm
• 20. The radius of small circle is 5cm, the radius of big circle is 7cm, the ratio of circumference of small circle to big circle is (), the ratio of area is ()