What is the geometric mean of two heat transfer areas A1 and A2?
A. $$\sqrt {{{\text{A}}_1} \cdot {{\text{A}}_2}} $$
B. $$\sqrt {{{\text{A}}_1} + {{\text{A}}_2}} $$
C. $$\frac{1}{2}\sqrt {{{\text{A}}_1} \cdot {{\text{A}}_2}} $$
D. $$2\sqrt {{{\text{A}}_1} \cdot {{\text{A}}_2}} $$
Answer: Option A
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