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⅔* 4,5√3= 2/3 *9/2√3= 18/6√3= 3√3
(3√3)² + h²= 9²
h²=9²- (3√3)²
h²=81-27
h²= 54
h=√54
h=3√6
h=a√3/2
h=9√3/2
(⅔h)²+H²=a²
(⅔*9√3/2 )²+H²=9²
(3√3)² +H²=81
9*3 +H²=81
H²=81-27
H²=54=9*6
H=3√6cm