A 5cm long and 3cm wide rectangle is enlarged by 3:1. What's the area of the figure? Attention, it's the scale! Use proportion to solve it!

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• 1. A rectangle 5cm long and 6cm wide is 4:1 enlarged, and the area of the figure is () square centimeter
• 2. It needs at least () cm long wire to make a rectangular frame with a bottom area of 16 square centimeters and a height of 5cm
• 3. If the edge length of a cube is a, the sum of its edge lengths is (); if a cuboid is 4.5cm in length, width and height, the sum of its edge lengths is () cm Use two cubes whose edges are 3cm long to form a cuboid. The surface area of the cuboid is (). Hurry!
• 4. What is the square of the surface area and the cube of the volume of a cuboid 10 cm long, 6 cm wide and 5 cm high?
• 5. A cuboid is known as a square whose bottom side is 5cm long, and its surface area is 210cm square. Find its volume
• 6. The bottom surface of a cuboid is a square with a side length of 5cm, and its surface area is 210 square cm. Height? Not only requires process, but also text explanation. Thank you Not only the process, but also the text. Thank you. Not only the process, but also the text. Thank you
• 7. A cuboid has the same width and height. If the length is removed by 2.5cm, it will become a square cuboid with a surface area of 150cm
• 8. Two cuboids, 5cm long, 4cm wide and 3cm high, can be assembled______ A cuboid with different surface area, the smallest surface area is______ Square centimeter
• 9. In the figure, the area of a square with the radius of the circle as the side length is 75 square centimeters
• 10. The perimeter of a circle and a square is equal. The area of a square is 5 square decimeters. What is the area of a circle? I need it this afternoon. Come on······
• 11. A rectangle, 5cm long and 3cm wide, is enlarged by 3:1 to calculate the area of the figure (135)
• 12. 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
• 13. 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
• 14. 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 ///
• 15. The area of a rectangle is 20cm. The ratio of length to width is 2:3. What are the length and width?
• 16. The perimeter of a rectangle is 150cm, and the ratio of length to width is 3 / 4:3 / 5? Please list the formula
• 17. 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;
• 18. Given that the area of a rectangle is (4a & sup2; - 81) CM & sup2; its length is (2a + 9) cm, then what is its width?
• 19. 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?
• 20. 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