Draw a circle in a square with a radius of 2 cm. How many kilometers is the circumference of the circle? How many kilometers is the area of the square?

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• 1. The area of a square is 2 square centimeters. If you draw a circle with one of its vertices as the center and one of its edges as the radius, then The area of a square is 2 square centimeters. If you draw a circle with one vertex as the center and one edge as the radius, what is the area of the circle
• 2. Draw the largest square in the middle of a circle with a radius of 6cm. What is the area of the square?
• 3. What is the area formula for a circle in a square?
• 4. Draw the largest circle in a square with an area of 64 square centimeters. How many square centimeters is the area of this circle? (it's better to have a formula)
• 5. In a square with an area of 20 square centimeters, draw the largest circle. What is the area of this circle in square centimeters?
• 6. How to make a circle with a diameter of 6cm and cut it into the largest square
• 7. Cut out the largest square in a circle of ten centimeters in diameter. What's the remaining area? Don't use those letter formulas
• 8. The outer diameter of a circular iron sheet is 7 cm, and the inner diameter is 0. What is the area of the circular iron sheet? It's the radius of the outer circle and the radius of the inner circle. Wrong number. Sorry
• 9. An annular iron sheet has an outer diameter of 1 decimeter and a ring width of 2 cm. What is the area of the annular iron sheet in square centimeter? emergency
• 10. A ring with an outer diameter of 4 decimeters and an inner radius of 1 decimeter. The area of the ring is______ Square decimeter
• 11. The area of a square is 3 square centimeters. Draw a circle with the vertex of a corner as the center and the side length as the radius, and find the area of the circle in the square?
• 12. Take the vertex of the square as the center of the circle, and its side length as the radius to draw a circle. The known square area is 12 square centimeters, so it is urgent to find the area of the member! I don't know what root no root, please use primary school knowledge to answer!
• 13. What is the equation of the straight line obtained by rotating the line 2x-y-4 = 0 counterclockwise around its intersection with the X axis?
• 14. Given that FX is an even function of period 2 and an increasing function in the interval [0,1], then f (- 5.5), f (- 1) and f (0) are of the same magnitude
• 15. My mother is going to buy a square tablecloth for the round table at home. The diameter of the round table is 1.3 meters and the height is 1.5 meters My mother is going to buy a square tablecloth for the round table at home. The diameter of the round tablecloth is 1.3 meters and the height is 1.5 meters. If you want to make the square tablecloth just touch the ground, how many meters should the diagonal length of the square tablecloth be? Have a formula!
• 16. Calculation integral ∫ 1 / (x * LNX) DX
• 17. The floor area of the room is 14.4 m2, and the floor is laid with exactly 40 identical square tiles. What is the side length of each tile? The accuracy of the results was 0.01
• 18. Let x1, X2 If xn is a sample from the population x ~ n (0,1), then the mathematical expectation of the sample mean is?
• 19. The perimeter of a square steel plate is 8 / 15 meters, and its area is square meters
• 20. Given xn = [1 + (- 1) ^ n] / n how to prove his limit is 0 by definition