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The cuboid with square cross section is 30cm long. If the length is increased by 5cm, the surface area will be increased by 80cm
5 cm long cuboid with a surface area of 80 cm;,
The perimeter of the section is 80 △ 5 = 16 cm,
And the section is square,
The side length of the section is 16 △ 4 = 4 cm,
The surface area of the original cuboid: 2 × 4 & # 178; + 16 × 30 = 512 CM & # 178
A cuboid with a height of 30cm and a square cross section. If the height is increased by 5cm, the surface area is increased by 960 square cm, and the surface area and volume of the original cuboid are calculated
Side length of cross section L
Because, 4 * 5 * l = 960
So, l = 48 cm
Therefore, the surface area of the original cuboid is:
S = 4 * 30 * 48 + 2 * 48 * 48 = 21168 square centimeter
Two identical cuboids form a cube. The surface area of the cube is 30cm. What is the surface area of the cuboid
What is the surface area of a small cuboid?
Two identical cuboids form a cube. The surface area of the cube is 30cm. What is the surface area of the cuboid?
30÷6×（6+2）÷2
=5×8÷2
=40÷2
=20 square centimeters
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