It is a tangent line
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Draw a line from the center of the circle to the edge. Where this line intersects the edge draw a line 90 degrees to it. This line is the tangent at the point of intersection.
Well if your telling me a line that is perfectly straight through the circle and intersects the center is 70mm long that would be the diameter.
It is the measurement from the middle point of a circle to the edge of the circle
Yes. The related link shows the procedure with pictures. Basically, draw a circle with the compass, then without changing the compass, put the point somewhere on the circle and make a small mark which intersects the circle. Now put the point at this intersection, and make another mark with the circle. Keep going until you have 6 marks, then take your straight edge and connect the marks.
The radius of a circle is the length of the line from the center of the circle to any point on its edge.