radius
radius
That's called the radius.
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 radius
radius
It is a tangent
It is the radius
The tangent.
Tangent.
A tangent. And it does not need to be a circle - it can be any curve.
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The name of a straight line joining two points on the circumference of a circle is a chord.If the line passes through the the centre of the circle it is called a diameter