4.
Suppose that the geometric mean between 6 and 12 is x thus we have :
x^2 = 6 × 12
x^2 = 72
x = + √72 Or x = - √72 ( unacceptable )
x = + √9 × √4 × √2
x = 6√2
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5. similarity ratio = 24/20 = 30/25 = 6/5
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