Distance Formula: If two points in a plane are
given by (x1, y1) and (x2, y2),
then the distance from (x1, y1) to (x2,
Definition of a Circle: A circle with radius r,
centered at (h,k) is defined as a set of points such that the distance
from any point (x, y) to the center (h,k) is equal to r.
Definition of a x-intercepts: If an equation for
y is given in terms of x, the x-intercepts will be all points such
that the equation give for y is equal to 0.
Definition of a y-intercepts: If an equation for
y is given in terms of x, the y-intercepts will be all points such
that the x value is equal to 0.