Find parametric equations for two circles c1 and c2 in space such that • c1 and c2 have the same radius; • c1 and c2 intersect at the points p(1, 2,−1) and q(1, 2, 1) and nowhere else.

It may be a numbers or cell preferences. a cell preferences is a cell or a range of cell  a worksheet and can be used in a formula so that microsoft office excel can find the values or data that you want that formula to calculate. it is in the excel and it is very important.