## Question

True or False?

A sphere with center P(x_0, y_0, z_0) and radius r consists of all points (x, y, z) that satisfy the inequality (x-x_0)^2+(y-y_0)^2+(z - z_0)^{2} <= r^2.

<= sign means that all points on the boundary of the sphere satisfy inequality and also all points inside the sphere.