and radius 
is given by 
. From the figure, we know that the radius of arc ADC is 4, but we don't know the measure of the arc. Since there are 360 degrees in a circle, the measure of arc ADC is equal to the measure of the arc formed by 
subtracted from 360. The measure of the arc formed by 
and 
. To find them, we can use basic trigonometry for a right triangle, since by definition, tangents intersect a circle at a right angle.
must then be 
(three significant figures as requested by question).I really need this question someone please help
...
Answers: 1
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