Is a line just an infinitely large circle?
132831
A circle with infinite radius is a line
56960
How can I show that circles in the complex plane correspond to circles on the Riemann sphere? How about lines?
152382
Can an infinite set A be larger than an infinite set B but still have the same cardinality?
135007
What does it mean to say image is formed at infinity?
69115
Imaginary line on the Earth is straight or not?
116377
The Sorgenfrey line ($\mathbb R$ endowed with the lower limit topology $\tau_l$) is Lindelöf
19504
what are the various fields in which circle is treated as infinite sided regular polygon?
19503
Why does a circle enclose the largest area?
74665
Must perpendicular (resp. orthogonal) lines meet?
52270
d3.js circle packing along a line
27933
Show that unit circle is not homeomorphic to the real line
12547
Is it okay to "ignore" small numbers in limits where $x$ approaches infinity?
68752
A few questions about infinite derivative.
116589
Outline radius?
117104
Is the punctured plane homotopy equivalent to the circle?
43492
When motion begins, do objects go through an infinite number of position derivatives?
150522
Do circles divide the plane into more regions than lines?