coplanar
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No. Stand in a cuboid room and consider the line joining the floor and the opposite wall. Line 1: the line joining the floor to the wall on your left. Line 2: the line the far wall to the wall to your right. Both these lines are perpendicular to the first, but they are not in the same plane.
No.
8 men lay 100 feet in 2 days.The same 8 men lay 50 feet per day.Each man lays 50/8 feet per day.So 3 men lay 150/8 feet per day.It takes them 8 days to lay 150 feet.
Colinear points mean that if you draw a (really long) line between any two of them, the line will pass through the others. Or simply: there can exist a straight line that can pass through all of them. These are colinear points: . .... .. One line can pass through all of them: These ar not colinear points: :. If I try to connect any two of them with a line, the third point will not lie on that line.
Because all sides are the same length, and it is a regular shape. It tessellates, because if you lay squares of the same size adjacent to each other, they will leave no gaps.