No-line bifocal is a generic name for a progressive. Opticians use the "no-line" bifocal term because sometimes patients are hear "progressive" and think "transitions" which are lenses that turn to sunglasses when exposed to UV light.
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Collinear lines lie on the same straight line.
They are the same.They are the same.They are the same.They are the same.
If the point is not on the line, then no they are not collinear. But if that point is on the line, then they are collinear. Points on the same line are collinear. Points not on the same line are not collinear or non collinear.
Yes. If points are on the same side of a line, they are in a half-plane.
The same line.