Draw the largest square in a circle with a circumference of 25.12 cm. What is the square area Let's talk about the idea and the test In line with the level of primary school students

To know the radius by circumference, the biggest square is to make its diagonal equal to the diameter of the circle
C = 2pir, so: r = C / (2pi) = 25.12 / 6.28 = 4; s positive = 1 / 2 * (d diagonal) ^ 2

RELATED INFORMATIONS

1. Given that the lengths of two sides of a right triangle are √ 32cm and √ 48CM respectively, find the perimeter and area of the right triangle
2. In a right triangle, if the length of a right side is 8cm and the perimeter is 20cm, how many square centimeters is the area of the triangle?
3. Given that the area of a rectangle is (4a & sup2; - 81) CM & sup2; its length is (2a + 9) cm, then what is its width?
4. It is known that the length of the rectangle is √ 6cm and the width is (√ 3-1) cm. Then what is the area of the rectangle;
5. The perimeter of a rectangle is 150cm, and the ratio of length to width is 3 / 4:3 / 5? Please list the formula
6. The area of a rectangle is 20cm. The ratio of length to width is 2:3. What are the length and width?
7. The length and width of the rectangle is 4:3, the width is increased by 20cm, the length is unchanged, it becomes a square, and the area of the original rectangle is calculated ///
8. The area of a rectangle is 4800cm ^ 2, and its length is 20cm more than its width Find the length and width of the rectangle
9. A 60cm long iron wire is enclosed into a rectangle with the ratio of length to width of 3:2, and the area of the rectangle is () CM & # 178;; if A 60cm long wire is used to form a rectangle with the ratio of length to width of 3:2, and the area of the rectangle is () CM & # 178;; if it is used to make a cuboid with the ratio of length to width of 1:2:2, the surface area of the cuboid is () CM & # 178; the volume is () CM & # 179
10. A rectangle, 5cm long and 3cm wide, is enlarged by 3:1 to calculate the area of the figure (135)
11. In a circle with a circumference of 25.12 cm, draw the largest square, the square area is___ Square centimeter
12. A cube with a centimeter long edge is cut into two identical cuboids. The surface area of the two cuboids is () cm more than that of the original cube; ①2a² ②3a² ③6a²
13. The surface area of a cuboid is 16000 square decimeters, and the bottom surface is a square with a side length of 40 cm. What is the volume of the cuboid
14. The surface of a cuboid is 162 square decimeters. Two opposite sides are 3 decimeters square. Find the volume of the cuboid
15. The surface area of a cuboid is 178 square decimeters, of which two opposite sides are a square with side length of 3DM. How much is the volume of this cuboid
16. The surface area of a cuboid is 178 square decimeters, of which two opposite sides are 3 cm square. Find the volume of the cuboid
17. How many cm is the surface area of a cube whose edge length is 12 cm divided into two identical cuboids
18. The surface area of the cuboid is () CM & # 178;, which is made up of five cuboids with the edge length of 2cm;, The surface area is reduced by () CM & # 178;, and the volume is () CM & # 179;
19. The surface area of the cuboid is 400 cm less than the sum of the three cuboids
20. There are two cuboids with the surface area of 12cm and 178, and the cuboid with the surface area of () cm and 178;