radius
radius
"Radius" is a measurement that refers to a circle. It's the distance from the circle's center to any point on its curve.
A circle
A circle is a plane figure consisting of a curve in which every point is equidistant from a fixed point called the center.
A circle is a closed curve where all points are equidistant from a fixed point called the center. It is a two-dimensional shape with no corners or edges.
The distance from the fixed point at the center of a circle to any point on the curve is called the radius.
If the curve is part of the circumference of the circle, it is called an arc.
A line segment with its endpoints on the circumference (curve) of a circle is called a chord of that circle. If it passes through the center of the circle (which it can, but does not have to do), it is called a diameter of the circle. See the links below for more information.Is called a radius.
The radius of a circle is one half of the circle's diameter, any line going from the center of the circle to the circle itself. A line connecting other points on a circle (or on any curve) is called a chord.
A circle.
That refers to the center of the circle that "fits best" - that follows the direction of a curve (locally) most closely. (The formal definition, of course, is a bit more complicated, and involves concepts of calculus, such as limits.)
A straight line that intersects a circle or curve at two points, but which has both end points outside the circle or curve is called a secant. A straight line that links two points on a circle or curve is called a chord. A straight line which touches a circle or curve at one point is called a tangent. A straight line that cuts a circle or curve at one point is a straight line.* For moving diagrams see Related links below this box.