The perimeter of a circular flower bed is 50.24m, in which three eighths of the area is reserved to grow Cyclamen. What is the area of Cyclamen? The outer diameter of the train wheel is 0.8m, and it turns 400 circles per minute. The train passes a bridge in 15 minutes. How long is the bridge? With a 15.7m long fence, the largest chicken fence should be enclosed. What figure should it form? What is its area?

The perimeter of a circular flower bed is 50.24m, in which three eighths of the area is reserved to grow Cyclamen. What is the area of Cyclamen? The outer diameter of the train wheel is 0.8m, and it turns 400 circles per minute. The train passes a bridge in 15 minutes. How long is the bridge? With a 15.7m long fence, the largest chicken fence should be enclosed. What figure should it form? What is its area?

The perimeter of a circular flower bed is 50.24m, in which three eighths of the area is reserved for planting Cyclamen. What is the area of Cyclamen? The radius of the flower bed: 50.24 △ 3.14 △ 2 = 8m, the area of Cyclamen is: 3.14 × 8 × 3 / 8 = 75.36m2, the outer diameter of the train wheel is 0.8m, 400 turns per minute