You maybe referring to the diameter of a circle or its tangent
A chord. a diameter also has endpoints on a circle, the only difference is a diameter goes through the center point and a chord doesnt have to go through the center. a diameter is considered a chord.
A radii is just a plural form of radius. A circle doesnt have one radius. The term radii is mostly used when talking about multiple circles.
it doesnt
it doesnt have a frount it is a circle
none the sun doesnt circle the planet planets circle the sun!!!
it doesnt open!
a line extends to infinity. a segment doesnt not though.
Denmark
To keep the leaf spring in place and it doesnt fall a part
the affron centre is a very unknown london center. it is a bit like a black market but it doesnt sell illigal stuff. just expensive stuff at awkwark prices!
the rain does not sink down to the centre of earth because it the centre of earth and nothing could be sink down to the centre
The 50cm mark isn't necessarily the ruler's centre of mass where it will balance. If the ruler is not uniform (i.e. it has a hole in it) its centre of mass will not be exactly in the middle.