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M$1 Answer
If by measure of an arc you mean the length of the arc (L below), it can be found by:
L = R * alpha(rad) where R is the circle's radius and alpha(rad) is the central angle of the arc in radians.
Alternately,
L = D * alpha(rad)/2 where D is the circle's diameter and alpha(rad) is the central angle of the arc in radians.
To go from an angle in degrees to radians use the following formula:
alpha(deg) = alpha(rad) * 360 / (2 * pi) (where pi is ~3.14159).
L = R * alpha(rad) where R is the circle's radius and alpha(rad) is the central angle of the arc in radians.
Alternately,
L = D * alpha(rad)/2 where D is the circle's diameter and alpha(rad) is the central angle of the arc in radians.
To go from an angle in degrees to radians use the following formula:
alpha(deg) = alpha(rad) * 360 / (2 * pi) (where pi is ~3.14159).
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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