Two planes orthogonal to a third plane are parallel F 2. Two lines parallel to a plane are parallel T 3. A plane and a line either intersect or are parallel T 4. Two lines parallel to a third line are parallel T 5. Two planes either intersect or are parallel F 6. Two planes parallel to a line are parallel F 7. Two lines either intersect or are parallel F 8. Two planes orthogonal to a line are parallel F 9. Two lines orthogonal to a plane are parallel T 10. Two planes parallel to a third plane are parallel F 11. Two lines orthogonal to a third line are parallel.