So that you have a point of reference.
"How far is it to the sun?"
8.
8 what?
Well, in this case, 8 light-minutes. Without the unit of measurement, the answer is meaningless.
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The measurements must be equal to each other.
Not always. The direction is only necessary if you're discussinga distance vector, but you're usually not.
I don't know, that's why i asked !!:DD I'm guessing its some kind of two measurements!xD
Yes they must be in the same units of measurements.
The question does not make sense as you have made an error with the measurements. The diameter is equal to exactly twice the radius. This must always be true in any circle. Your measurements do not agree and thus they are wrong and this question can't be answered with confidence.