the answer is a Tangent.
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A tangent is a line that touches a circle at exactly one point. It is perpendicular to the radius at the point of contact.
This is the radius of the circle. It connects the center of the circle to any point on the circumference. The length of the radius is constant for a given circle.
The line of latitude at 66 degrees 30 minutes south is known as the Antarctic Circle. This line marks the southernmost point at which the sun can be seen at its highest point in the sky during the December solstice. On this line, there will be one day per year where the sun does not set (during the summer solstice) and one day where it does not rise (during the winter solstice).
The equator is the longest line of latitude as it is located at the circumference of Earth, and the circumference of Earth is always the longest compared to anywhere as the theory is the same of the circumference of a sphere.
The equator is at 0 degrees latitude, which means it is the line that divides the Earth into the Northern Hemisphere and the Southern Hemisphere. It is the widest part of Earth's surface, and the only line of latitude that is a great circle.
A circle inside another circle is called a concentric circle. This means that the circles share the same center point, with one circle contained entirely within the other.