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#### bergausstein

##### Active member

- Jul 30, 2013

- 191

a. the set of points on a given line exactly one unit from a given point on that line.

b. the set of points in a given plane that are exactly one unit from a given point in that plane.

i'm confused with the part saying "one unit from a given point on that line and "one unit from a given point in that plane. it seems to me that these phrases give hints that the sets are finite. please correct me if i'm wrong.

2. show that if A is a proper subset of B and $B\subseteq C$ then, A is a proper subset of of C.

thanks!