Draw the largest circle in a rectangle 10cm long and 6cm wide. What is the area of the circle? Cut off the circle, how many square meters are left?

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• 1. A piece of rectangular paper, 5cm long and 4cm wide, cut the largest circle in the rectangle, what is the area of the circle?
• 2. How many cm is the radius and circumference of the largest circle on a 10 cm long and 6 cm wide rectangular paper? If you subtract this circle, how many square centimeters is the remaining area?
• 3. The diameter of a circle is equal to the side length of a square. Comparing their area, the result is (). A. equal B. the area of a circle is larger C. the square has a large area
• 4. 6. If the perimeter of a square is equal to twice the perimeter of a circle, find the ratio of the square area to the circle area?
• 5. The area of a circle is equal to that of a square. Why is the circumference of a circle less than that of a square
• 6. The area of a circle is equal to that of a square. The circumference of the circle is greater than that of the square Is that right? Why
• 7. Draw a square, take the side length of the square as the radius, if the area of the square is 20 square centimeters, find the area of the circle
• 8. Draw the largest square in a circle, the area of the square is 1 cm & sup2;, and the area of the circle is ()
• 9. There are two cuboids with the surface area of 12cm and 178, and the cuboid with the surface area of () cm and 178;
• 10. The surface area of the cuboid is 400 cm less than the sum of the three cuboids
• 11. A piece of rectangular paper, 8cm long and 6cm wide, is to cut the largest circle on the rectangular paper. The area of the circle is () cm A.28.26 B.113.04 C.50.24
• 12. Divide a circle into 16 equal parts to form an approximate rectangle. The circumference of the approximate rectangle is 16 cm longer than that of the circle. What is the area of the circle square centimetre?
• 13. Cut a circle along the radius to form an approximate rectangle. The circumference of the rectangle is 6cm longer than that of the circle. What is the area of the circle?
• 14. Cut an average of 16 parts of a circle to form an approximate rectangle. The circumference is 4cm longer than the original one
• 15. It is known that the area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm=______ ．
• 16. It is known that the area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm=______ ．
• 17. It is known that the area of a big circle is the sum of the areas of two small circles. If the radius of the big circle is RCM and the radius of the two small circles are 2cm and 3cm respectively, the value of R is obtained
• 18. It is known that the area of a circle with radius RCM is the sum of the areas of two circles with radius 2cm and 3cm, and the value of R is obtained
• 19. For a circle with radius r, if the radius increases X and the area of the circle increases y, then the functional relationship between Y and X?
• 20. The area of a circle is 10 square centimeters. If its radius is doubled, the area of the circle will be 10 square centimeters______ Square centimeter