Question 1007140
What is 5pi/4 radians in degrees? 
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pi rads = 180 degs
pi/4 rads = 45 degs
etc.
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In general, r rads = r*180/pi degs
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A ship is traveling around the outside rim of an island surveying a good place to land. If it is 10 miles from a lighthouse at the center of the island and 45° from due north, how far has the ship traveled from the most northern tip of the island to the nearest tenth?
It's traveled 45/360 = 1/8 of the circumference (if it traveled clockwise)
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What are the sine, cosine, and tangent of 7pi/4  radians?
Use a calculator or check the unit circle.
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How long is the minute hand on a clock whose tip travels 15 cm from 1:15 to 1:30 to the nearest tenth? 
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That's 90 degs, 1/4 of the circumference
--> C = 2pi*r = 60 cm
Solve for r