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.
The line that goes edge to edge of a circle and passes through the center is called the diameter. It is the longest chord of the circle, dividing it into two equal halves. The diameter is twice the length of the radius, which is the distance from the center of the circle to any point on its circumference.
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.
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.