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α=30⁰
h=4,5√3cm
1/2 d=4,5 cm
d=9 cm
Pp=1/2 *d²
Pp=1/2*9²
Pp=81/2 cm²
V=1/3Pp*h
V=1/3*81/2*9/2√3
V=27/2*9/2√3
V=243/4 √3 cm³