Equations of circles are a nobrainer. If aliens can do it, so can you. All you do is substitute the center of the circle's coordinates into the equation and plug in the radius. Voilà! You have your equation.

Up Next:
Attributes of Circles 
Up Next:
Area of a Sector 
Up Next:
Equations of Circles 
Up Next:
Perimeter and Circumference 
Up Next:
Shmoop? What is that? 
Up Next:
Jane Eyre Summary 
Up Next:
What is Shmoop? 
Up Next:
ACT Math 4.5 Elementary Algebra