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When will a line on the ceiling be parallel to a line on the floor?
When the walls are true and vertical - they at least stand a chance!!
If a room is 20 square meters. what is the square meter age of ceiling and walls?
I take it you mean the area of the floor is 20 sq metres? In which case the ceiling would be the same size, but you can't calculate the area of the walls without knowing their height.
A ladder is leaning against a wall if you were going to climb the ladder are you better off if there is no friction between the ladder and the wall or ladder and the floor?
No. if the floor is smooth you must have friction between the ladder and the floor, or the ladder would just slide away. Technically you could do without friction between wall and ladder, but even that can be helpful in preventing the ladder from going sideways.
How many square feet does a room measuring 21.5 feet 21.5 feet have?
(21.5) x (21.5) = 462.25 -- It has 462.25 square feet on the floor. -- It has another 462.25 square feet on the ceiling. -- It has (21.5 times the height of the room) square feet on each of the four walls.
It takes you 60 seconds to walk from the first ground floor of a building to the fourth floor. How long will it take to walk from the first floor to the eighth floor?
It takes 20 seconds for each floor. Therefore, it will take 140 seconds for you to reach the eighth floor.
