The area of a square is 16 square decimeters, the area of a circle is () square decimeters; if the area of a square is 20 square decimeters, the area of a circle is () square decimeters

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• 1. According to the requirements: as shown in the figure, the square area is 18dm2, find the area of the circle
• 2. As shown in the figure, the square area is known to be 84 square decimeters. What is the area of this circle There is a biggest circle in a square
• 3. According to the requirements: as shown in the figure, the square area is 18dm2, find the area of the circle
• 4. Given that the area of a square is 18 square centimeters, find the area of a quarter circle in the square
• 5. There is a circle in the picture. There is a small square in the circle. It is known that the area of the small square is 18 square centimeters. What is the area of the circle
• 6. The perimeter of a circle and a square is equal. It is known that the side length of a square is 2.14 cm. What is the area of this circle
• 7. The perimeter of a square with a side length of 7.85 cm is equal to that of a circle, which has an area of () square cm What do you want to fill in the brackets? Can the kind man tell me?
• 8. In a circle, the largest square only tells you the side length of the square is 10 cm. How to find the area of the circle?
• 9. Cut a square with a side length of 10 cm into the largest circle. What is the area of the circle? Its area is about a fraction of that of the square
• 10. What is the area of the largest circle cut from a square piece of paper with a side length of 10 cm?
• 11. The range of an automatic rotary sprinkler irrigation device on the park grassland is 10 meters. What is the area it can spray irrigation? The girth of a small trunk is 125.6cm. The cross-sectional area of the trunk is approximately circular. What is its area?
• 12. Fill in the blanks (area of the circle) in sixth grade mathematics 1. Divide the circle into several equal parts, which can be arranged into an approximate () shape. The () of this figure is equivalent to the () of the circle, and its width is the () of the circle. Therefore, the formula of expressing the area of the circle with letters is () 2. A circle with diameter of 6dm, area of (), perimeter of () 3. The circumference of a circle is 15.7dm, and its area is () 4. The radius of the circle expands to 2 times of its original, its perimeter expands to () times of its original, and its area expands to () times of its original 5. Draw the largest circle in a rectangle of 3cm in length and 2cm in width. The area of the circle is ()
• 13. It's the area of the circle of the formative self - test question in unit 4 of the sixth volume of primary school mathematics For example, I will fill in the blanks 1. In the same garden, there are (innumerable) diameters and (innumerable) radii
• 14. one (1) The window of the city library is semicircle above, and a rectangle 1.6 meters high and 1.2 meters wide below. What's the area of this window? (the number is reserved for 2 decimal places) elder brother and elder sister, please (2) How many meters does it take to decorate the border of this window 2. Dad gave a round table bread at home with 3.768 meters long color bar (ignoring the joint). How many square meters is the area of this round table?
• 15. What is the area of the largest triangle on a semicircular steel plate with a diameter of 4cm?
• 16. As shown in the figure below, the area of a square is 2 square decimeters, and the area of a circle is one fourth of a circle, which is square
• 17. Draw a circle with the largest area in a square with a side length of 4cm. If you cut off the largest circle, what is the area of the remaining part?
• 18. Draw a circle with the largest area in a square with a side length of 4cm. If you cut off the largest circle, what is the area of the remaining part?
• 19. In a square with a side length of 5cm, draw the largest circle with a radius of () and an area of (). The ratio of its area to that of the square is ()
• 20. Draw the largest circle in a square with a side length of 5cm. The area of the circle accounts for ()