The diameter of a round lid is 36 cm. What's its perimeter and area?

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• 1. A circular reservoir is 25.12 meters when walking around it. What's its floor area? A circumference is 31.4 decimeters. What's the area of this circle
• 2. For a round pool, a 1-meter-wide path should be paved around it. How many square meters is the area of the path?
• 3. The perimeter of a circular pool is 62.8 meters. There is a one meter wide path around the pool. What is the area of the path
• 4. If the circumference of a circle is equal to that of a square, the area of the circle () the area of the square A. Greater than B. less than C. equal to
• 5. The circumference of a circular pool is 18.84 meters. How many square meters is the area?
• 6. A round flower bed with a circumference of 25.25, what is the floor area of this flower bed Please help me figure it out, thank you!
• 7. A square solid iron block with a side length of 10 cm is placed in the center of the horizontal table top with an area of 0.2 m2 to calculate the mass of the iron block and the pressure on the table top The density of iron is 7.9 * 10 cubic
• 8. Square area 10 square centimeter side length how many
• 9. The side length of a square is 5cm. The side length of a square is increased by 10%. How many percent is its area increased
• 10. An object with a volume of 100cm and a bottom area of 10cm is placed on a horizontal table with a pressure of 2 × 10 PA
• 11. The circumference of a square is 12 cm. Draw the largest circle in the square. The circumference of the circle is 12 cm______ Cm
• 12. Cut a piece of 24 decimeter square paper into the largest circle. What is the circumference and area of the circle?
• 13. The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What are the areas of the big circle and the small circle? The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What is the ratio of the area of the big circle to the area of the small circle, and what are the areas of the big circle and the small circle
• 14. The radius of the big circle is r, and the area of the small circle is 4 / 9 of that of the big circle
• 15. As shown in the figure, the area of the shadow part is 40 square centimeters. How many square centimeters is the area of the big circle larger than that of the small circle?
• 16. As shown in the figure, the area of the shadow part is 18% of the area of the big circle and 38% of the area of the small circle. If the area of the shadow part is 15 square centimeters, find the total area of this figure
• 17. There are two circles, big and small. The area difference between them is 62.8 square decimeters, and the radius of the big circle is 1.5 times that of the small circle? There are two circles, big and small. The difference of their area is 62.8 square decimeters, and the radius of big circle is 1.5 times that of small circle
• 18. The radius of the big circle is twice that of the small circle. The area of the big circle is 12 square decimeters larger than that of the small circle. What is the area of the big circle?
• 19. The shadow area in the figure below is 3 square centimeters, which is one seventh of the area of the big circle and one fourth of the area of the small circle. What is the blank area?
• 20. The length of a machine part is 5mm, and the drawing is 4cm. The scale of this drawing is calculated