![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The length, width and height of a cuboid are respectively ABC decimeters. If the height increases by 2 decimeters, the volume increases (); the surface area of cubic centimeter increases () square decimeters
The length, width and height of a cuboid are respectively ABC decimeters. If the height increases by 2 decimeters, the volume increases by (2Ab) cubic centimeters, and the surface area increases by (2a + 2b) square decimeters
The length, width and height of a cuboid are respectively ABC meters. If the height is increased by 4 meters, how much will the volume of the new cuboid increase compared with the original cuboid?
ab(c+4)＝abc+4ab
So we added 4AB
The length, width and height of a cuboid are 5m, 3M and 2m respectively. The cuboid's volume is () cubic decimeter
5x3x2=30m3=30x1000=30000dm3
A cuboid steel is 2 meters long, 2 decimeters wide and 20 cm thick. What is the volume of this steel?
2 × (2 △ 10V = 200 * 20 * 20 = 80000 cubic centimeter)
）× (20 △ 100) = v = 2 * 0.2 * 0.2 = 0.08 (M2) 0.08 M3
The length, width and height of a rectangle are ABC. If the height minus 2, the volume of the new rectangle will be reduced by several cubic meters
The removed part is a new cuboid, 2 in height, a in length and B in width,
The part removed is the part reduced
Reduced area: S = 2Ab
The area of three sides of a cuboid is 6, 8 and 12
24
The area of the three sides of the cuboid is 6, 8 and 12, and the volume is?
6=2*3 8=2*4 12=3*4 2*3*4=24
The area of three sides of a cuboid is 3, 6 and 8 square centimeters. The cuboid's volume is equal to () cubic centimeter. A.9b.10c.11d.12
From the analysis, we know that: because AB = 3, AC = 6, BC = 8; the two sides are multiplied respectively, (ABC) 2 = 3 × 6 × 8, that is: (ABC) 2 = 144, because 12 × 12 = 144; so the volume is 12 cubic centimeters; so the answer should be: D
A cuboid has a surface area of 70 square decimeters and a bottom area of 9.8 square decimeters. The perimeter of the bottom is 12.6 decimeters. What is the height of the cuboid? What's the volume?
70-9.8 × 2 = 50.4 (square decimeter), 50.4 △ 12.6 = 4 (decimeter), v = sh = 9.8 × 4 = 39.2 (cubic decimeter); a: the height of the cuboid is 4 decimeters, and the volume is 39.2 cubic decimeters
There are two cuboids of the same size, 8 cm long and 5 cm wide. If the two cuboids are combined into a larger cuboid, the surface area is the largest
How many square centimeters? What is the minimum surface area?
Maximum (8 * 5 + 5 * 3 + 3 * 8) * 4-3 * 5 * 2 = 286 square centimeters
Minimum (8 * 5 + 5 * 3 + 3 * 8) * 4-8 * 5 * 2 = 236 square centimeters
RELATED INFORMATIONS
- 1. 1. A cuboid is 8 cm long, 5 cm wide and 2 cm high. What are its surface area and volume? 2. The total edge length of a cube is 48 decimeters. What are its surface area and volume 3. A cuboid is 4 meters long, 3 meters wide and 1 meter high. What are its volume and surface area 4. The volume of a cylinder is 18 cubic decimeters, the height is 0.9 decimeters, how many square decimeters is the bottom area? 5. The bottom area of a cone-shaped sand pile is 1.5 square meters, the height is 0.4 meters, and each cubic meter of sand weighs about 1.8 tons. How many tons of sand are there in total
- 2. In △ ABC, points D and E are AB and AC respectively. Let CD and be intersect at point O. if ∠ a = 60 °, DCB, EBC = half a, find an angle equal to a
- 3. In △ ABC, B & # 178; = A & # 178; + C & # 178; - AC, then the value of B is
- 4. It is known that: in △ ABC, the edges of angles a, B and C are a, B and C respectively, and a & # 178; + C & # 178; - B & # 178; = # 189; AC (1) Find the value of cos2b (2) If B = 2, find the maximum area of △ ABC
- 5. In △ ABC, 2b = a + C, B & # 178; = AC, then △ ABC must be () A. Acute triangle B, obtuse triangle C, isosceles triangle D, equilateral triangle The scope is the five required exercises of sine theorem and cosine theorem in mathematics,
- 6. Let a, B, C opposite the three interior angles of △ ABC, if its area s = C ^ 2 - (a-b) ^ 2, then Tan (C / 2) =?
- 7. In the triangle ABC, if a is known to be an acute angle and B = 3asinb, then Tana=
- 8. In the triangle ABC, we know that 2sinbxcosc = Sina, a = 120 degrees, a = 1, and find the area of B and triangle ABC
- 9. In △ ABC, note that a, B and C are opposite sides of a, B and C respectively, and S is the area of triangle, and prove that C ^ 2-A ^ 2-B ^ 2 + 4AB ≥ 4 √ 3S This is the 19th question of the test paper. It's not very difficult, but I haven't thought about it for a long time. Please help me solve it~ PS: because the characters are not standard, I'll use words to explain it again. Verification: the square of C minus the square of a minus the square of B plus 4AB is greater than or equal to 4 times the root sign 3 times s~
- 10. It is known that a and B belong to (0, positive infinity), and 2C > A + B
- 11. Add three numbers after 865 to form a six digit number, so that it can be divided by 3, 4 and 5 respectively, and make the value as small as possible, then the six digit number is______ ．
- 12. If there is a 1994 digit a which can be divided by 9, the sum of its digits is B, and the sum of its digits is C, then C =?
- 13. A three digit number is represented by ABC. It is known that it can be divided by 2, 3 and 5 at the same time, and a + C = 8. What is the three digit number?
- 14. In triangle ABC, a, B and C are the opposite sides of angles a, B and C respectively. If (a + B + C) (B + C minus a) is equal to 3bC, the value of angle a can be obtained
- 15. In the triangle ABC, the angle c = 90 ° and CE is the middle line of the triangle ABC. If AC = 4 and BC = 3, what is the area of the triangle AEC?
- 16. Let the inner angles a, B and C of △ ABC be opposite to a, B and C respectively. We know that a = 4, B = 5 and C = 61. (I) find the size of angle c; (II) find the area of △ ABC
- 17. The new operation X & y = ax + by + C, a, B, C of the definition of rational number XY are the values of 2-7 when 1 & 2 = 9-3 & 3 = 60 & 1 = 2 is known
- 18. In △ ABC, ∠ C = 90 °, ab = 41, the perimeter of △ ABC is 90, try to find the area of △ ABC,
- 19. The trilateral lengths a, B and C of △ ABC satisfy a + B = 8, ab = 4 and C2 = 56. Try to judge the shape of △ ABC and explain the reason
- 20. It is known that in △ ABC, a = 1 / 2 B, B = 3 C, find a, B, C