In the figure, the area of a square with the radius of the circle as the side length is 75 square centimeters

3.14 × 75 = 235.5 (square centimeter); a: the area of a circle is 235.5 square centimeter

RELATED INFORMATIONS

1. The perimeter of a circle and a square is equal. The area of a square is 5 square decimeters. What is the area of a circle? I need it this afternoon. Come on······
2. If the perimeter of the square in the figure is 4cm, then the area of the circle is______ Square decimeter (π = 3)
3. Put the circle together into an approximate rectangle. The length of the rectangle is 6.28 decimeters. The area of the circle is______ Square centimeter, perimeter is______ Decimeter
4. According to the requirements: as shown in the figure, the square area is 18dm2, find the area of the circle
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7. The radius of a circle is equal to the side length of a square. The area of a square is 3 square decimeters. The area of this circle is 3 square decimeters
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15. What is the square of the surface area and the cube of the volume of a cuboid 10 cm long, 6 cm wide and 5 cm high?
16. If the edge length of a cube is a, the sum of its edge lengths is (); if a cuboid is 4.5cm in length, width and height, the sum of its edge lengths is () cm Use two cubes whose edges are 3cm long to form a cuboid. The surface area of the cuboid is (). Hurry!
17. It needs at least () cm long wire to make a rectangular frame with a bottom area of 16 square centimeters and a height of 5cm
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20. A rectangle, 5cm long and 3cm wide, is enlarged by 3:1 to calculate the area of the figure (135)