A belt is to go around two pulleys of radii 1 inch and 2 inches with centers 6 inches apart. How long should the belt be? [Hint: See Problem 40.]
Problem 40
Find equations of the lines tangent to (x − 4)2 + y2 = 4 and (x + 2)2 + y2 = 1. [Hint: See the previous problem for the number of tangent lines.]
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