for 2D objects:
square root of new area / square root of old area
for 3D objects:
cube root of new volume / cube root of old volume
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The answer will depend on what has a measure of 84 deg and the object for which the measure is required.
It is a measure of the centre.
To measure length around objects.
Lengths - in units that are marked on the tape measure.
The opposite of the verb measure might be not to measure, or to guess.