The angle at the circle centre is required.
Draw a line from each end of the chord to the circle centre.
Draw a line from the centre of the chord to the centre of the circle creating two right angle triangles, the hypotenuse of both = the radius (7 metres).
Then >
Length of chord = ((Sine ( centre angle / 2 ))* 7) * 2
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Then the radius bisects the chord.
Multiply the radius by (2 x pi) to get the circumference.
You cannot. If you rotate the circle around its centre, the lengths of the radius and chord will remain the same but the coordinates of the chord will change.
A chord is when two points in a circle are connected by segment. A diameter is a chord, but not a radius. The radius is not a complete segment in the circle
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