Question

Вода покрывает 3/4 земной поверхности сколько квадратных км земной поверхности занимает суша? Радиус земли считать =6375

Answer 1

Земля - шар, поверхность Земли - сфера, тогда

Sсферы=$4\pi R^2=4*3.141592654*6375^2=\\ \\=12.5663*40640625=510702286$

 

Sсферы= примерно 511 миллионов кв километров, тогда

S океана = 511*3/4=383,25 млн кв километров

 

Не надо забывать, что земля - не идеальный шар, а сплющенный у полюсов, отюда и выскочит погрешность + погрешность точности задачи. Думаю погрешность моего ответа не будет больше 5-7%

Answer 2

Calculation of Land Area on Earth

To calculate the land area on Earth, we need to subtract the water-covered area from the total surface area of the Earth. According to the information provided, water covers 3/4 of the Earth's surface.

The radius of the Earth is given as 6375 km To calculate the total surface area of the Earth, we can use the formula for the surface area of a sphere:

Surface Area of a Sphere = 4πr^2

Substituting the given radius value, we can calculate the total surface area of the Earth:

Total Surface Area of Earth = 4π(6375)^2

To calculate the land area, we need to subtract the water-covered area from the total surface area. Since water covers 3/4 of the Earth's surface, the land area can be calculated as:

Land Area = Total Surface Area of Earth - (3/4) * Total Surface Area of Earth

Let's calculate the land area using the given radius value:

Land Area = (1 - 3/4) * 4π(6375)^2

Now, let's calculate the land area:

Land Area = (1 - 3/4) * 4 * 3.14159 * (6375)^2

Land Area ≈ 0.25 * 4 * 3.14159 * (6375)^2

Land Area ≈ 3.14159 * (6375)^2

Land Area ≈ 3.14159 * 40640625

Land Area ≈ 127,516,246.90625 square kilometers

Therefore, the land area on Earth is approximately 127,516,246.90625 square kilometers.

Please note that the above calculation is an approximation and may not be completely accurate due to rounding errors.