1) 60 degrees, B. The radius of a circle drawn to the point any tangent touches the circle is perpendicular. The angle between the tangent and that radius is 90 degrees. In each of those triangles, OAT and OBT one angle is 60, the second is 90, and thus the third in each (angles ATO and BTO) is 30. The angle between the tangents is made up of ATO and BTO, so it is 30 * 2 = 60 degrees.
2) The ratio between the angle that makes up the arc and 360 is the same as the ratio between the arc length and the entire circumference.
C=2*pi*r = 2*(3.14)*6 = 37.7
The arc is 360 - 2*60 = 360-120=240
So the arc length is found with the ratios 
Cross multiply.
360x = 37.7*240
Divide both sides by 360
x = 37.7*240/360 = appox. 25.13 (D.)
3) AOT is 60 degrees. Convert degrees to radians by multiplying by pi/180
60*pi/180 = 1.047 (C)
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