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wysokosc bryły=h
kraw,podstawy=a
sin40=h/d
0,6428=h/12
h=12·0,6428
h=7,7 cm
cos40=a/d
0,766=a/12
a=12·0,766
a=9,19
Pp=a²=(9,19)²=84,456cm²
objetosc bryly
V=Pp·h=84,456·7,7≈650,31≈650 cm³