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Q: This is a line segment between the center and a point on the circle or sphere.?

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radius

A radius; considering a sphere is a 3-D version of a circle.

It is the radius of the sphere

A line segment extending from the center of a circle or sphere t o the circumference or bounding surface.

Let's be very careful here: The "great circle" of a sphere is a circle that lies on the surface ofthe sphere, so there's no way the great circle can "pass through" the sphere's center.However, in order for the circle to be a "great circle", its center must be the center of the sphere.

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radius

Radii is the plural of radius. A radius is the length of a line segment between the center and the circumference of a circle or sphere.

A diameter - provided it meets the boundary of the circle or sphere on opposite sides.

A radius; considering a sphere is a 3-D version of a circle.

No. Every circle on the sphere whose center is also the center of the sphere is a great circle. If the circle's center is not also the center of the sphere, then the circle is a small circle.

A "great circle" is any circle on a sphere whose center is also the center of the sphere. The shortest distance between two points on the surface of a sphere is a piece of the great circle on which both points lie. A "small circle" is any circle on the sphere that's not a 'great' circle.

A great circle is any circle on the surface of a sphere whose center is at the center of the sphere. The shortest distance between two points on the surface of a sphere is a part of the great circle that passes through them.

It is the radius of the sphere

A line segment extending from the center of a circle or sphere t o the circumference or bounding surface.

Let's be very careful here: The "great circle" of a sphere is a circle that lies on the surface ofthe sphere, so there's no way the great circle can "pass through" the sphere's center.However, in order for the circle to be a "great circle", its center must be the center of the sphere.

a secant

NO it is not.