314.16 square k,.
1220 km in radius 2250 km thick
The total land area of India is: 3,287,590 km² (1,269,346 sq mi)
Mars' radius is 3376 km, the core (inner and outer combined) has a radius of 3482 km. They're close. Comment: I guess the question is about the Earth's core. The answer fits that.
from Wikipedia: http://en.wikipedia.org/wiki/Continental_United_States The 48 states and D.C. together have an area of 3,119,884.69 square miles (8,080,464.25 km²). Of this, 2,959,064.44 sq mi (7,663,941.71 km²) is land, comprising 83.65% of U.S. land area. Officially, 160,820.25 sq mi (416,522.38 km²) is water area, comprising 62.66% of the nation's water area. Its 2000 census population was 279,583,437, comprising 99.35% of the nation's population. Its population density was 94.484 inhabitants/sq mi (36.48/km²), compared to 79.555/sq mi (30.716/km²) for the nation as a whole. Entered into WikiAnswers Sept 9, 2009
2,439.7 km or 2,439,700 m give or take 1,000m -from Wikipedia.
6362 square kilometres.
Area of a circle = (pi) x (square of radius) = (pi) x (5)2 = 25 pi = 78.54 square km (rounded)
A circle with a radius of 0.9 km has an area of 2.54 square km
The surface area of Mars is approximately 144,798,500 square kilometers. The equatorial radius is about 3,396 km and the polar radius is 3,376 km.
An area of 5km radius implies a circle. The area of a circle of radius r is {pi}r2. Area ~= 3.14 x 5 x 5 km2 ~= 78.54 km2.
Using 3.14 as Pi the area of circle is: 615.44
The answer depends on what is 10 km: the radius, diameter, perimeter. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
It is: pi*352 = 3848.451 square km to 3 decimal places
It is: 4*pi*64002 square km
It is: 270/360*pi*2 squared = 3*pi square km
Area of circle: pi*6.5^2 =132.732 square km to 3 decimal places
First of all, there is no reason to suppose that the area is circular as opposed to rectangular or triangular or some other simple or complicated shape. If, on the basis that the question asks for the radius, you assume that it is a rectangle, then the radius is 0.564 km = 564 metres.