That's known as the circumference.
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?
The radius
radius
Radius
A tangent. And it does not need to be a circle - it can be any curve.
The tangent.
Tangent.
That's called the radius.
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A straight line from the center to the edge of a circle is called a radius. The radius measures the distance from the center to any point on the circumference of the circle.
The line around a circle is called the circumference. It is the distance measured along the outer edge of the circle. The circumference is calculated using the formula ( C = 2\pi r ), where ( r ) is the radius of the circle.