Q: What is the name of straight line bisecting a circle?

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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

radius

A tangent. And it does not need to be a circle - it can be any curve.

The tangent.

That's called the radius.

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Bisecting the line.

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

radius

radius

A tangent. And it does not need to be a circle - it can be any curve.

It is the radius

Tangent.

The tangent.

That's called the radius.

Tangent

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.

It is called the diameter. The line that goes halfway through the circle is the radius.The length of a straight line through the center of a circle is called the diameter. Any other object I'm not sure has a name; perhaps the length...width...or height