In this tutorial, I will help you, the watcher, solve circular equations such as the area, radius, diameter, and circumference.

The diameter is the entire length of the globe. In this case, be hypothetical and see this as a 2 dimensional circle instead of a spinning 3-dimensional globe. In this circle, the diameter is 14 in. Thus the radius is 7 in. Remember that the radius is half the length of the diameter.

To determine the area, evaluate the equation A=(pi)r^(2)
A=(3.14)(7 in)^(2)
A=3.14*49in^(2)
A=153.86 in^(2)

To determine the circumference, evaluate the equation
C=2*pi*r
Recall the similarities between the equations of the area and of the circumstances. However, the unit for the area will be squared.
Also notice that since the diameter is 2r, the equation for the circumference is also
C=pi*d
C=(3.14)*14 in
C=43.96 in