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H²+R²=8²
R=2/3*a√3/2
R=a√3/3
R=8√3/3
H²+(8√3/3)²=8²
H²+(64/3)=64
H²=192/3 - 64/3
H²=128/3
H=√128/3
H=8√2/√3
H=8√6 /3 cm