Question

what are four coplanar points?

Answer 1

Coplanar

Lying in the same plane. For example, any set of three points in space are coplanar.

(This is a handy math dictionary.)

http://www.mathwords.com/c/coplanar.htm

Answer 2

So, look at the definition of coplanar and then post what you think 4 coplanar points would be.

Answer 3

@andy123123 Coplanar points lie in the same plane. So, if you had 4 coplanar points, what would that mean?