Provide an appropriate response.
A connecting rod 28 cm long joins a crank 18 cm long to form a triangle with a third, imaginary line. If the crank and the imaginary line form an angle of 145°, find the angle formed by the connecting rod and the imaginary line. 
A. 2.5°
B. 17.5°
C. 13.4°
D. 21.6°
Answer: D
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