6362 square kilometres.
Jordan covers an area of 92,300 km2, of which just 329 square km is water.
The city of Perth, Australia has an area of 5,386 km²
Two square kilometers.
13.9 sq miles (36 km²).
Syria's area is 185,180 km²
Area of a circle = (pi) x (square of radius) = (pi) x (5)2 = 25 pi = 78.54 square km (rounded)
314.16 square k,.
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
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
The Earth is only approximately spherical, not perfectly so. Its polar radius is 6,357 km while the equatorial radius is 6,378 km and a mean radius of 6,371 km. These give estimates for the distance around the Earth, at latitude 45, of between 28,243 km and 28,337 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.