380 likes | 392 Views
If parallel lines lie in two distinct planes, the planes must be parallel. FALSE. Three planes can intersect at a point. TRUE (ex: corner of classroom). Three planes can intersect at a line. TRUE. If two lines in space are not parallel, then they must intersect. FALSE (Skew lines).
E N D
If parallel lines lie in two distinct planes, the planes must be parallel.
If two lines in space are not parallel, then they must intersect.
If lines are perpendicular to the same plane, they are parallel.
If a line is perpendicular to a line in a plane, then it is perpendicular to the plane.
FALSE (Mailbox problem… must be perp. to two lines in plane passing through foot)
If a line is perpendicular to one of two parallel planes, then it is perpendicular to the other.
If a line is perpendicular to a plane, then it is perpendicular to all lines in the plane.
If separate planes contain skew lines, the planes are parallel.
FALSE (an angle is formed by lines – this is called a dihedral angle)
In a plane, if two lines are perpendicular to the same line, they are parallel.
In space, if two lines are perpendicular to the same line, they are parallel.