Subtract the largest circle from a cube cardboard with a side length of 10cm. The area of this circle is () cm2? The remaining leftover material is ()

The largest circle is subtracted from a cube cardboard with a side length of 10 cm. The area of this circle is (78.5) cm2, and the remaining leftover material is (21.5 square cm)

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1. Saw the largest circle on a square board with a side length of 20 cm. The area of the circle is______ Square centimeter. What's the rest of the leftover material______ Square centimeter
2. Only know the diameter of the circle, diameter 10cm, how to calculate the largest square area in the circle?
3. In a circle with a diameter of 10 cm, draw the largest square. The diagonal of the square is a circle () A. Radius B. diameter C. perimeter D. arc length
4. Cut the largest square on a circular paper with a diameter of 10 cm. What is the area of the square?
5. For a square with a side length of 10cm, draw a circle with a radius of 10cm on the opposite vertex. What is the overlapping area of the middle? Ask for the formula, don't send the answer directly
6. A 10 cm wide rectangular wood strip is sawed from a square board. The area under the saw is 800 square meters. Then the side length of the square board is 10 cm
7. The diameter of a semicircle paper is 10 cm, and its circumference is 10 cm______ The area is______ ．
8. The area of the ring is 200 cm square, the radius of the outer circle is 10 cm, and the radius of the inner circle is 10 cm?
9. The sum of the edges of a cube is 72cm. What are its surface area and volume?
10. The total edge length of cube is 72cm. What is the surface area and volume?
11. Cut the largest circle on a 20 cm square cardboard. The area of the circle is (), and the remaining leftover material is ()
12. The side is a 10 cm cube with a gravity of 100 n. put it in the center of the table with a side length of 50 cm The force of 20n is the pressure on the table at this time
13. Physics problem: put a piece of cube wood with a side length of 10 cm in the center of the horizontal table with an area of 1 m and 178; to solve the problem How much pressure does the wood block exert on the tabletop? P wood = 0.6 × 10 ^ 3kg / m ^ 3, g = 10N / kg)
14. A square wood block with 10 cm side length and 6 N weight is placed on a horizontal table with an area of 0.9 square meters Find the pressure of the block on the table. If placed in the center of the 80 square centimeter table, find the pressure of the wood block on the table.
15. Physics! A square wood block with 10 cm side length and 6 N weight is placed on a horizontal table with an area of 0.9 square meters
16. Place a square block on the horizontal table with a side length of 10cm. The block weighs 1kg. Calculate the pressure of the block on the table?
17. What is the pressure of aluminum on the table when a cube aluminum block with a side length of 10 cm is placed in the middle of a table with an area of 1 square meter? (p aluminum = 2.7P water)
18. What is the pressure on the table of a square with a weight of 10N and a side length of 10cm?
19. The side length of a square block is 10 cm. Put it on a horizontal table and calculate its pressure on the table (it is known that the density of wood block is 0.6 * 10 cubic n / kg; g = 10N / kg)
20. A square metal block with a side length of 0.1M and a mass of 10kg is placed in the center of a horizontal desktop with an area of 1 square meter, and the metal block is pushed horizontally by 12n Liya How much pressure does the metal block exert on the table? (g = 10)