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The centre of a circle.
No, a sphere and a circle are different geometric shapes. A sphere is a three-dimensional object with all points equidistant from the center, while a circle is a two-dimensional shape with all points equidistant from the center. In other words, a circle is a flat, circular shape, while a sphere is a three-dimensional, round object.
If you create third circle with radius 2, then all the points on that circle would be equidistant form both circles. So the answer is a circle with radius 2.
No, an oval is not a type of circle. A circle is a two-dimensional shape with all points equidistant from the center, forming a closed curve. An oval, on the other hand, is a two-dimensional shape that resembles an elongated circle, but its radii are unequal. In other words, an oval has two different radii, while a circle has only one.
A circle does not have a set of parallel lines in the traditional sense, as parallel lines are defined as lines that never intersect and remain equidistant from each other. However, you can draw lines that are tangent to a circle at various points, and these tangent lines can be parallel if they are at the same distance from the center of the circle. But in the context of the circle itself, it does not contain parallel lines.