First, get the 12 degrees and 28 minutes into decimal form by adding 28/60 to 12, obtaining 12.46667 degrees. Then multiply by pi / 180 to convert to radians, obtaining 0.2175844 radians.
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12/9 pi or 3.83972 radians (rounded)
It is 82 degrees and 12 minutes, as in the question = 82.2 deg = 1.4347 radians.
180 degrees
Convert the degrees to radians. Also, you need the radius, not the diameter. In that case, the distance along the circle is simply the product of the angle, and the radius.
The hour hand of a clock completes one full rotation, or 360 degrees, in 12 hours. This means that the hour hand turns 30 degrees per hour. So, in 12 hours, the hour hand will turn a total of 360 degrees.