Geometric Mean
GM = √(ab) · Inserting n means · AM ≥ GM
Say what a geometric mean is
Derive GM = √(ab)
Insert n geometric means between two numbers
Prove AM ≥ GM and say when they are equal
2, 6, 18 is a GP with ratio 3
√(2 × 18) = √36 = 6
A 2 by 18 rectangle and a 6 by 6 square both have area 36
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