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a²/4 +h²=a²
h²=a²- a²/4
h²=(4a²-a²)/4
h²=3a²/4
h=a√3/2
(⅔h)²+H²=a²
(⅔*a√3/2)²+H²=a²
(a√3/3)²+H²=a²
3a²/9 +H²=a²
H²=a² -a²/3
H²=(3a²-a²)/3
H²=2a²/3
H=a√2/√3 *√3/√3
H=a√6/3