r-a)*(r-b)=0 (the dot product) represents a sphere. Find its radius and centre.

Q: Find an equation of the sphere that passes through the point (7, 5, -3) and has center (5, 8, 1).

A:

Coordinate Geometry

Coordinate geometry, also known as analytic geometry or Cartesian geometry in classical mathematics, is a type of geometry that is studied using a coordinate system. Coordinate geometry is a branch of mathematics that describes the position of points on a plane using an ordered pair of numbers called coordinates.