Geometric mean of 2 and 12 is 4.898979485566356.
Look at link: "Calculation of the geometric mean of two numbers".
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Geometric mean of 9 and 16 is 12. Look at link: "Calculation of the geometric mean of two numbers".
The geometric mean of any two numbers is the square root of their product, in this case sqrt 12 or sqrt4 x sqrt3 ie 2 root 3 or 3.4641
√29 x √12 = 5.3851648071345 x 3.46410161513775 = 18.6547581061776
Their geometric mean is the cube root of 8*4*12 = cuberoot(384) = 7.268 (to 3 dp)
18.97367