Question

Determine whether statement (3) follows from statements (1) and (2) by the law of detachment or the law of syllogism. If it does, state which law was used. If it does not, write invalid.

(1) Two segments intersect in one point.
(2) The segments are in the same plane.
(3) The segments are perpendicular.
a.
yes; law of detachment
b.
yes; law of syllogism
c.
invalid