What is the circumference of a sphere of radius 2?

The circumference of a sphere of radius 2 is 12.56 square unit

Solution:

Need to determine circumference of the sphere of radius 2.

As sphere is three dimension object and circumference is attribute of two dimension object , here circumference of the sphere means circumference of spheres largest circle which contains the center of the circle.  

Circumference of circle = 2πr

where π is a constant having value as 3.14 and r is radius of the circle.

In our case radius = r = 2 unit, as π is constant it will be 3.14 in all the cases

Substituting value of r and πin formula of circumference, we get

Circumference = = 12.56 square unit.

Another Method:

The Circumference of a sphere is equal to 6.2832 times the Radius

Thus Circumference = = 12.56 square unit

This is the answer :

x=–1

Choose (B)