By definition of the word, "revolution", there is only 1 revolution in a complete circle. You may be trying to ask a different question, such as how many radians are in one revolution. That answer is 2pi radians.
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That the formular for the circumference of a circle (pii D)The answer should be 4.254
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Any tangent must contain a point outside the circle. So the answer to the question, as stated, is infinitely many. However, if the question was how many tangents to a circle can be drawn from a point outside the circle, the answer is two.
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Every circle by definition has 360 degrees. If it did not have 360 degrees, it would not be a circle. Therefore, 16 degrees of a circle is 16o over 360o.