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a=24 cm
Pp=a²√3/4
Pp=24²√3/4 = 144√3 cm²
rysunek w zalaczniku
x=2/3h
x=2/3*12√3 = 8√3 cm
H²+x² = 20²
H² = 400-(8√3)² = 400-64*3 = 400-192 = 208
H=√208 = 4√13
V=1/3*Pp*H
V=1/3 * 144√3 * 4√13 = (192√39) cm³