Find the missing length(s) in the right triangle. Give an exact answer and, where appropriate, an approximation to three decimal places.
A. a = 40 cm; c = 20 cm
B. a = 30 cm; c = 1200 cm
C. a = 20 cm; c = 40 cm
D. a = 20 cm; c = 1200 cm
Answer: C
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