Infinite when chords are parallel to the circle's diameter
No, a circle can't be a parallelogram. A circle is a curve. A parallelogram is a quadrilateral with two pairs of parallel sides constructed with four line segments. The line segments are straight, and the circle is a continuous curve.
Do you mean, like, the Earth? The equator. If you mean the line going from side to side across the middle of a circle then... the diameter of a circle
infinite
When a circle is rotated about a line that lies in the same plane as the circle and does not intersect it, the three-dimensional figure formed is a cylinder. If the line is outside the circle and parallel to its axis, the result is a cylindrical shell. If the line is the diameter of the circle, the figure formed is a sphere. The specific shape depends on the position of the line relative to the circle.
Pair of radii
No, parallel lines are straight lines.
None.
lines of latitude
a semi - circle has zero parallel lines
No, a circle can't be a parallelogram. A circle is a curve. A parallelogram is a quadrilateral with two pairs of parallel sides constructed with four line segments. The line segments are straight, and the circle is a continuous curve.
Do you mean, like, the Earth? The equator. If you mean the line going from side to side across the middle of a circle then... the diameter of a circle
The two points on exactly opposite sides of a circle are parallel to each other. This can be evidenced by finding the derivative/gradient at those points; if they are the same then the two line segments described by those points are parallel.
infinite
A circle.
When a circle is rotated about a line that lies in the same plane as the circle and does not intersect it, the three-dimensional figure formed is a cylinder. If the line is outside the circle and parallel to its axis, the result is a cylindrical shell. If the line is the diameter of the circle, the figure formed is a sphere. The specific shape depends on the position of the line relative to the circle.
Pair of radii
A pair of parallel lines, an ellipse or a circle.