12 Lines a and b intersect at point P. Line c passes
through P and is perpendicular to the plane
containing lines a and b. Which statement must be
true?
1)
2)
3)
4)
Lines a, b, and c are coplanar.
Line a is perpendicular to line b.
Line c is
b.
perpendicular to both line a and line
Line c is perpendicular to line a or line b, but
not both.