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If your question refers to the Geometric Mean of 9 and 11 then the GM of any two numbers is √ab. Then the GM of 9 and 11 = √(9 x 11) = √99 = 9.9499 (5sf)
√16 x √81 = 4 x 9 = 36
sqrt(9 * 16) = sqrt(144) = 12
The geometric mean of two numbers is the square root of their product. In this case, the geometric mean of 9 and 35 would be the square root of (9 * 35), which is the square root of 315. Simplifying this, we get the square root of 9 * 35 = 3 * √35, which is approximately 16.73.
√4 x √12.5 = 2 x 3.53553390593274 = 7.07106781186548