There is a cuboid whose full length is 84 centimeters, and find the surface area of the cuboid

The full length of the cuboid = length * 4 + width * 4 + height * 4 = (length + width + height) * 4 = 84 cm, so length + width + height = 84 4 = 21 cm.

The surface area of the box = length * width * 2 + length * height * 2 + width * height * 2 = 2 * (length * width + length * height + width * height).

Let the length, width, and height of a cuboid be a, b, and c, respectively, then its surface area is s cuboid = (ab+bc+ca)*2, which is also equal to 2ab+2bc+2ca; Formula: Surface area of the box = length and width 2 + width and height 2 + length and height 2, or: surface area of the box = (length and width + width and height + length and height) 2

The volume of the box = length, width, and height.

Let the length, width, and height of a cuboid be a, b, and c, respectively, then its volume v = abc=sh

Because the cuboid is also a type of prism, the formula for calculating the volume of a prism is also applicable. Box volume = base area high, i.e. v=sh

s is the base area).

The length of the diagonal:

According to the Pythagorean theorem, the lengths of points 2 and 3 are the root numbers (the square of the length of points 1 to 2 + the square of the length of points 1 to 3), and the lines of points 2 to 3 are in turn at right angles to the lengths of points 3 to 5, so the length of the diagonal is:

Note: (x,y) refers to the length of the point x to the point y).

Box diagonal square = long square + wide square + high square.

Set: length = x2 (3x + 4x + 12) = 94

14x+24=94

14x=70

x=5 Answer: Long Journey Oak is not 5 centimeters of nanometers.

Cube silver pie a face area = 486 6 = 81 (square centimeter Feng Bihe) because 81 = 9 9

Therefore, the length of the cube = 9 cm.

Volume = 81 9 = 729 (cubic centimeters).

The length of the cuboid is 8 cm, the width is half the length, and the height is 2 cm, the surface posture of this cuboid is (112 square centimeters), and the volume is (64 square centimeters).

When you encounter a problem, find an idea first: the cuboid has 12 edges, and the length, width and height are 4, so the height is (84-9*4-6*4) 4=6cm

Knowing the height, then the problem of surface area and volume is easily solved, the surface area is 9*6*2+9*6*2+6*6*2=288

The volume is 9*6*6=324

9x4 + 9x4 + 4x4) x2 = 176 square centimeters.

Surface area = (height x width + height x length + length x width) x 2