If the circumference of a rectangle is 12cm and the length is twice the width, what is its area?

Let the length be x, then the width be 2x
2（x＋2x）=12
2x＋4x=12
6x=12
x=2
2x=4
2×4=8
The area is 8 square centimeters

RELATED INFORMATIONS

1. It is known that the circumference of a rectangle is 20cm and the length is 2cm more than the width. If the length of a rectangle is xcm and the width is YCM, the equations listed are as follows You have to have a system of equations,
2. The perimeter of a rectangle is 118cm, and its length is 20cm more than its width?
3. The perimeter of a rectangle is 20cm. The ratio of length to width is 4:1. What is the area of the rectangle?
4. The circumference of a rectangle is 26cm. If the length of the rectangle is reduced by 1cm and the width is increased by 2cm, it will become a square. If the length of the rectangle is xcm, the equation () A. x-1=（26-x）+2B. x-1=（13-x）+2C. x+1=（26-x）-2D. x+1=（13-x）-2
5. The circumference of a rectangle is 26cm. If the length of the rectangle is reduced by 1cm and the width is increased by 2cm, it will become a square. If the length of the rectangle is xcm, the equation () A. x-1=（26-x）+2B. x-1=（13-x）+2C. x+1=（26-x）-2D. x+1=（13-x）-2
6. The circumference of a rectangle is 26cm. If the length of the rectangle is reduced by 1cm and the width is increased by 2cm, it will become a square. If the length of the rectangle is xcm, the equation () A. x-1=（26-x）+2B. x-1=（13-x）+2C. x+1=（26-x）-2D. x+1=（13-x）-2
7. The sum of the edges of a cuboid is 80cm, and its bottom is a square with a circumference of 20cm. The volume of the cuboid is
8. If the perimeter of the base is 20cm, the volume of the cuboid can be calculated No, it's a cube. 20 / 4 = 5, 5 * 5 * 5 = 125 cubic centimeter, please come from university
9. A cuboid, its bottom circumference is 20cm, its volume is () cm3
10. A cuboid. The bottom surface is a cuboid with a circumference of 24 cm. If you unfold the side of the cuboid to get a cuboid, what is the surface area of the cuboid
11. The circumference of the rectangle is 12cm, and the length is twice the width. If the width is xcm, the equation about X can be listed as follows:
12. The perimeter of a rectangle is between 40 cm and 50 cm. If the ratio of its length to width is 5:7, what is the perimeter of the rectangle? What is the area
13. A brick is 24cm in length, 12cm in width and 5cm in height. What's its volume? How many bricks are there in a cube
14. When the length of a rectangle is reduced by 5cm and the width is increased by 12cm, it becomes a rectangle, and the perimeter of the rectangle is 100cm less than twice the perimeter of the original rectangle Calculate the length and width of the original rectangle (unit: cm)
15. A brick is 24cm long, 12cm wide and 5cm thick. If the brick is placed on the ground to make it most stable, what is the floor area of the brick
16. As shown in the figure, a chopstick with a length of 24cm is placed in a cylindrical water cup with a diameter of 5cm at the bottom and a height of 12cm. If the length of the chopstick exposed on the outside is HCM, the value range of H is () A. 0＜h≤11B. 11≤h≤12C. h≥12D. 0＜h≤12
17. As shown in the figure, the length of the rectangle is 12cm, the width is 5cm, the area of the triangle is 24cm2, what is the area of the shadow part
18. A rectangle paper of 20cm in length and 12cm in width is used to form a cylinder. The maximum side area of the cylinder is () CM & # 178;
19. The bottom area of a cone is 20 cm, the height is 12 cm and the volume is 10 cm________ . 2. The bottom radius of a cone is 2 mm, the height is 6 DM, and the volume is. 3. The diameter of the bottom of a cone is 6cm, the height is 4cm, and the volume is. 4. The radius of the bottom of a cylinder is 10cm and the volume is. The volume of a cone equal to its base and height is. 5. The circumference of the bottom surface of a cone is 6.28m, 5m, and the volume is. The volume of a cylinder with the same base and height is.
20. Xiao Hong uses a piece of rectangular paper with a length of 12cm and a width of 8cm to cut it into the largest triangle (as shown in the figure). What is the area of the paper (shadow part) cut off?