Such a line, if it is straight, is a diameter.
If they share the same centre - they're 'concentric'
It is the radious. I'm pretty sure
A quarter of a circle, formed by two radii forming a right angle at the centre, is called a quadrant.
transversal
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None of Iceland crosses the Arctic Circle, but all of the country is within less than 215 miles of it. So, depending on what you call "sizable" and "close", every town in Iceland could qualify.
ship
We call it a "semi-circle"
If we have set up a call centre we have to first take idea from those who setuped the call centre .
Scab
A mountain range.
its called a bridge.