Which is the equation of the sphere with unit radius having centre at the origin ?

What is the equation off the sphere with unit radius having center at the origin?

Find the equation of the sphere which has centre at the origin and touches the line 2(x+1)=2-y=z+3.

Find the equation of the sphere which has centre at the origin and touches the line 2(x+1)=2-y=z+3 .

Find the equation of the sphere which has centre at the origin and touches the line 2(x+1)=2-y=z+3

Find the equation of the sphere which has centre at the origin and touches the line 2(x+1)=2-y=z+3.

Find the equation of the sphere which has centre at the origin and touches the line 2(x+1)=2-y=z+3.

Which one of the following is the differential equation of family to circles having centre at the origin ?

which one of the following is the differential equation to family of circles having centre at the origin ?

Show that the differential equation of the family of circles having their centres at the origin and radius 'a' is : x+y (dy)/(dx)=0 .