Cut the largest circle in a rectangle 5cm long and 4cm wide. The area of the circle is () square centimeter. The perimeter is the remaining area of () cm It's () square centimeter

Cut the largest circle in a rectangle 5cm long and 4cm wide. The area of the circle is (4 π) square centimeter. The perimeter is (4 π) cm. The remaining area is 20-4 π square centimeter

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1. In a 8 cm long, 5 cm wide rectangular cardboard cut a largest circle, circle area is______ Square decimeter
2. As shown in the figure, put a circular shear with a radius of 10cm into an approximate rectangle, and the perimeter of the current rectangle is () cm A. 31.4B. 62.8C. 72.8 D、82.8
3. If the circumference of a circle is equal to that of a square, the area of the circle is larger than that of the square______ (judge right or wrong)
4. The diameter of a circle and the side length of a square are both equal to 8 cm. Who is the larger of the area of a circle and that of a square fast
5. Three identical cubes are used to form a cuboid. The surface area of the cuboid is 84dm2. The surface area of the original cube is 84dm2______ dm2．
6. 1. Make a cuboid with six small cubes whose edges are 2cm long. The surface area of the cuboid is () CM & # 178;, and the volume is () CM & # 179 2. In a rectangle, draw a line segment and divide it into a maximum isosceles right triangle and a trapezoid
7. The surface area of a cuboid is 178dm, and its two sides are 3DM long squares. What is the volume of the cuboid?
8. If you cut a cube with an edge length of 9 decimeters into three identical cuboids, the surface area of each cuboid is () square decimeters A. 162B. 270C. 243
9. In a circle with a circumference of 25.12 cm, draw the largest square, the square area is___ Square centimeter
10. If the perimeter of a right triangle is 48 cm and the sum of the sides of two right angles is 28 cm, the area of the triangle can be calculated?
11. Cut out the largest circle in the rectangle with a length of 10cm and a width of 8cm. What is the area and perimeter of the circle
12. Put a circle into an approximate rectangle, increase the circumference by 4cm, then the circumference of the circle is (), and the area is ()
13. If the radius of a circle is doubled, its area will be increased by 24 square centimeters. What is the original area of the circle
14. What is the ratio of diameter to radius and length in the same circle
15. The radius of a circle is 15.84 meters longer than its circumference?
16. For a circle with a radius of 10 cm, when the radius is increased by 10%, how much is the area of the circle increased? Come on, I'm in a hurry. I have to answer with primary school knowledge,
17. The radius of the circle increased by 6cm from 3cm, and the area of the circle increased by () square centimeter A. 27πB. 36πC. 72πD. 9π
18. The radius of the circle has increased from 6 cm to 9 cm, and the area of the circle has increased by () square cm? Explain the reason, three grams of oil Every step should be explained;;;
19. Find the area of the following circle r = 8 cm C = 25.12 decimeters d = 2.6 meters
20. If the sum of the diameters of two circles is a and R is the radius of a circle, then the sum of the areas of the two circles is a