the equater
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The diameter
The equator
There is no such thing as a prime meridiam. The prime meridian, on the other hand, is a longitude: an imaginary line on the surface of the earth that goes from the North Pole to the South Pole and passes through the Royal Observatory in Greenwich, London.
The equator is the collection of every point on the earth's surface that is at equal distances from both north and south poles.There are so many of them that if you drew them all on a globe, they would look like a line, all the way around the middle of the globe.Actually it is just the imaginary line that goes right around the earth at an equal distance from the north and south poles the whole time. there is only one line
A chord. The diameter is technically a chord goes through the middle point.