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~APEX~ A parallel line through a point not on the line
~APEX~ A parallel line through a point not on the line
perpendicular line segment (apex)
A cube has 12 edges, and each edge is perpendicular to 4 other edges. However, since each perpendicular relationship is counted twice (once for each edge), the total number of unique perpendicular line segments in a cube is 12. Thus, a cube has 12 perpendicular line segments.
The diameter is the length of a line segment perpendicular to the side of the cylinder, passing through the center of the cylinder, from a point on one side to a point on the opposite side of the cylinder. It is also twice the radius and is related to the circumference by a factor of pi.