In the image, point A marks the center of the circle. Which two lengths must form a ratio of 1:2?

A ratio of 1:2, first length is half the second?
Oh: any radius and any diameter will do.
Also: any arc halfway around (from one end of a diameter to the other) and the circumference, will do.
For the rest, who knows: if they gave no further information, neither can we!

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