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The hidden line is drawn, however, the edges of the center line can still be seen ( the center line ends up appearing as extra long dashes on either side of the end of the hidden line)
The positive (+) side and the negative (-) side.
it would be pi times the perpendicular length from the center to the shorter side times the perpendicular length from the center to the longer side.
a straight line passing from side to side through the center
A diameter.