It is the same length from the centre to any point on the circumference so just measure it
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No, a tangent is a line that intersects a circle at exactly one point. The radius of a circle is the distance from the center of the circle to any point on the perimeter of the circle.
The radius of a circle is the length of the line from the center of the circle to any point on its edge.
The center of a circle is the same for all circles but the length of the radius can change
The radius is the distance from the center of the circle to its edge. No matter how you draw this radius, it is one value of one length only, for any given circle.
diameter is 2 times the length of the radius and is a line straight through the center of the circle. radius is half of the diameter and is a line from the center to a edge of the circle