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What is the geometric mean of two heat transfer areas A1 and A2 ?

/ Chemical Heat Transfer / By
What is the geometric mean of two heat transfer areas A1 and A2 ?

A. √(A1 . A2)
B. √(A1 + A2)
C. ½ √(A1 . A2)
D. 2 √(A1 . A2)