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wysokosc podstawy =h
wysokosc graniastoslupa =H
kraw,podstawy=a
α=30°
sin30°=h/d
1/2=h/10
2h=10 /:2
h=5
h=(a√3)/2
5=(a√3)/2
a√3=10
a=10/√3
a=(10√3)/3 cm
Pp=(a²√3)/4 =[(10√3/3)²·√3 ]/4=(300√3/12)=25√3 cm²
z pitagorasa;
a²+H²=d²
(10/√3)²+H²=10²
H²=100-100/3
H=√(200/3) =10√6/3cm
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v=PpH=25√3*10√6/3=250√2 cm³