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H dl. wysokosco ostroslupa
d=a√2 dl. przekatnej kwadratu (podstawy)
Odcinki o dl a ; a√2/2 ; H tworza trojkat prostokatny
H²+ (a√2/2)²=a²
H²+(6√2)²=12²
H²+72=144
H²=144-72
H²=72
H=√72
H=√36*√2
H=6√2 {cm]
Wysokosc ostroslupa wynosi 6√2 [cm]