Technically there are an infinite number of radii in a circle. A radius is a line from the center of the circle to a point on its edge, and since there are an infinite number of points on a circle's edge there are an infinite number of radii.
In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.
An arc (circumference only), or a segment.
Only when one of them is the circle's diameter which is the circle's largest chord.
there are two Pi in a full circle so there is only one Pi in one radian.
Only round the perimeter of the circle (not across its interior) because a segment is a part of a line or curve between two points.
circle
A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".
In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.
Regardless of where you mark two points on a circle, there's only one possible line segment between them. It's called a "chord" of the circle.
The area of a circle is 'pi' multiplied by the square of the circle's radius.The volume of a circle is zero. As a circle has only two dimensions.The volume of a sphere is (4/3 pi) multiplied by the cube of the sphere's radius.
An arc (circumference only), or a segment.
Only the diameter can divide the circle in to two equal parts.
There is only one Arctic Circle.
Draw two diameter lines, then draw a circle inside the circle.
Mars has two moons : Phobos and Deimos .
A circle is defined by only one measure, ot two, as in this question.
A triangle with only two of its sides equal. Also a semi-circle or any incomplete circle.