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How much is sin20 - cos20? What are the steps The result is a number. Keep four significant numbers
Sin20 degree - cos20 degree = radical 2 (radical 2 / 2sin20 degree - radical 2 / 2cos20 degree) = - radical 2 (radical 2 / 2cos20 degree - radical 2 / 2sin20 degree) = - 2cos (20 + 45) = - radical 2cos65 degree
So you're going to look it up... - 0.5977
(-sin20°+2cos10°)÷cos20°=?
The original formula = [2cos (30-20) - sin20] / cos20 = (2cos30cos20 + 2sin30sin20-sin20] / cos20 = (2 * radical 3 / 2 * cos20 + 2 * 1 / 2sin20-sin20) / cos20 = (radical 3cos20 + sin20-sin20) / cos20 = radical 3cos20 / cos20 = radical 3
A cuboid has a surface area of 184 square centimeters, a bottom area of 20 square centimeters, and a bottom perimeter of 18 centimeters. What is its height
It's better to have a formula
The area of the bottom is 20 square centimeters, and the perimeter of the bottom is 18 centimeters;
And the surface area is 184 square centimeters, so the height is 8 centimeters
There is a cuboid with a surface area of 184 square centimeters, a bottom area of 20 square centimeters, and a bottom perimeter of 18 centimeters. The cuboid has a volume of______ Cubic centimeter
20 × [(184-20 × 2) △ 18], = 20 × [(184-40) △ 18], = 20 × [144 △ 18], = 20 × 8, = 160 (cubic centimeter). Answer: the volume of this cuboid is 160 cubic centimeter. So the answer is: 160
A cuboid has a surface area of 368c & nbsp; M2, a bottom area of 40C & nbsp; M2 and a bottom perimeter of 36cm______ ．
According to the analysis, 368-40 × 2 = 288 (square centimeter), 288 △ 36 = 8 (centimeter), 40 × 8 = 320 (cubic centimeter). Answer: the cuboid volume is 320 cubic centimeter. So the answer is: 320 cubic centimeter
For a cuboid, the surface area is 368 square centimeters, the bottom area is 40 square centimeters, and the perimeter of the bottom surface is 36cm
Quick answer, before 9:30 this evening, or I will die! If I answer after 10 this evening, I will not offer a reward!
There are two more questions: 2. The length and width of a rectangular steel slab are 6 cm and the height is 3 cm. If we want to forge this steel slab into a cuboid with a bottom area of 27 square cm, how many cm will the height become?
3. A partition wall of 25 meters long, 30 cm thick and 2 meters high should be built in the garden of the park. If 525 bricks are used per cubic meter, how many bricks will this wall earn?
Side area 368-40 × 2 = 288 square cm
So the height is 288 △ 36 = 8 cm
So the volume is 40 × 8 = 320 cubic centimeters
A cuboid has a surface area of 368c & nbsp; M2, a bottom area of 40C & nbsp; M2 and a bottom perimeter of 36cm______ ．
According to the analysis, 368-40 × 2 = 288 (square centimeter), 288 △ 36 = 8 (centimeter), 40 × 8 = 320 (cubic centimeter). Answer: the cuboid volume is 320 cubic centimeter. So the answer is: 320 cubic centimeter
A cuboid has a surface area of 368c & nbsp; M2, a bottom area of 40C & nbsp; M2 and a bottom perimeter of 36cm______ ．
According to the analysis, 368-40 × 2 = 288 (square centimeter), 288 △ 36 = 8 (centimeter), 40 × 8 = 320 (cubic centimeter). Answer: the cuboid volume is 320 cubic centimeter. So the answer is: 320 cubic centimeter
How to calculate the volume and surface area of cuboid and cube
Hello, little t-fei
Cuboid volume = length × width × height
Surface area of cuboid = (L × W + W × H + H × L) × 2
Cube volume = edge length × edge length × edge length
Surface area of cube = edge length × edge length × 6
A cube has a perimeter of 8 decimeters, a surface area of () square decimeters and a volume of () cubic decimeters
A cube has a perimeter of 8 decimeters, a surface area of () square decimeters and a volume of () cubic decimeters
A cube has a perimeter of 8 decimeters, a surface area of (24) square decimeters and a volume of (8) cubic decimeters
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