Radius
radius
A tangent. And it does not need to be a circle - it can be any curve.
The tangent.
That's called the radius.
The curved line that traces the boundary or perimeter of a circle is called the circumference. A straight line that touches the circle at just one point is called a tangent. See the related link, 'The Parts of the Circle', below this answer.
Isn't it the radii?
Radius
radius
The radius
A tangent. And it does not need to be a circle - it can be any curve.
Tangent.
The tangent.
That's called the radius.
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The measurement of the outside edge of a circle is known as the circumference.
Radius.