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H = 10cm
R = ⅔h
h = ½a√3
R = ⅔*½a√3
R = ⅓a√3
R = ⅓a√3 /*3
3R = a√3 /:√3
√3R = a
a = √3*2√3
a = 3*2
a = 6
V = ⅓Pp*H
Pp = ¼a√3
V = ⅓*¼*6√3*10
V = 5√3 cm²
Odp. Objętosc ostroslupa wynosi 5√3 cm²