EWAN
Improved Answer:-
They are both used to mark out right angles which are perpendicular lines that intersect each other at 90 degrees.
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For this level, you need to press the color buttons in the order of how much color there is... most to least. Press the red, green, yellow, then blue, square buttons in that order. See related link for screenshots.
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Number of sides of a hypercube depends on the level. A point is a hypercube of dimension zero. If one moves this point one unit length, it will sweep out a line segment, which is a unit hypercube of dimension one. If one moves this line segment its length in a perpendicular direction from itself; it sweeps out a two-dimensional square. If one moves the square one unit length in the direction perpendicular to the plane it lies on, it will generate a three-dimensional cube. This can be generalized to any number of dimensions. For example, if one moves the cube one unit length into the fourth dimension, it generates a 4-dimensional unit hypercube (a unit tesseract). You can research polytopes for many examples.
The square root of 69 is 8 somethin', right?'Cause I've been tryin' work it out, ohhhhh!But on a more professional level, the square root of 69 = 8.30662386
A plumb line is a weighted string which when hung from a fixed point and allowed to become motionless, indicates perpendicular to level. Perfect for aligning vertically that first piece of wallpaper.