Adjacent walls of a room is an example of perpendicular lines.
Which of the following is a true statement ?
(a) The floor and a wall of a room are parallel planes.
(b) The ceiling and a wall of a room are parallel planes.
(c) The floor and the ceiling of a room are parallel planes.
(d) Two adjacent walls of a room are parallel planes.
Which of the following is an example of perpendicular lines?
1. Corners of your circular room floor.
2. One of the angles in both the set squares of geometry box.
3. Angle included between the hour hand and minute hand when it is 12:15 in your wall clock.