The geometric mean of 9 and 81 is 27.0
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mean = (4 + 81)/2 = 85/2 = 42.5
The geometric mean of 9 and 25 is: 15.0
geo. mean=√(49x81)=7x9=63
Just use the definition of geometric mean. Multiply the two numbers, then take the square root of the result. (To take the geometric mean of three numbers, multiply all of them, then take the cubic root, etc.)
Geometric mean of 9 and 16 is 12. Look at link: "Calculation of the geometric mean of two numbers".