its the celestial sphere, Mr. Smith taught me that today, smart man!
The great circle passing through these points is called the meridian. It is an imaginary line that runs from the north celestial pole to the south celestial pole, passing through the zenith (overhead point) and intersecting the horizon at the north and south points.
This is the diameter of the circle.
This is a line segment called a diameter of the circle.
it can be called the diameter of the circle. or a chord
The line passing through the center of a circle with two endpoints on the circle is the circle's diameter.
International Date Line
It is called a diameter if it goes from end to end and radius if it is half way the circle.
It is its square area which is found by pi*radius squared
No, the diameter is the distance across a circle passing through its center. The distance around a circle is called the circumference.
a diameter
No, a secant line does not pass through the center of a circle. A secant line is a line that intersects a circle in two distinct points. Only a line passing through the center of a circle is called a diameter.
A circle through the Earth's sphere perpendicular to the observer's latitude