H=9cm
z wlasnosci kata ostrego 30° wynika ze:
a√3=H
a√3=9
a=9/√3=9√3/3=3√3 cm--->krawedz podstawy
Pp=a²·√3/4=(3√3)²·√3/4=27√3/4cm²
obętosc graniastosłupa
V=Pp·H=27√3/4 ·9=243√3/4 [cm³]
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H=9cm
z wlasnosci kata ostrego 30° wynika ze:
a√3=H
a√3=9
a=9/√3=9√3/3=3√3 cm--->krawedz podstawy
Pp=a²·√3/4=(3√3)²·√3/4=27√3/4cm²
obętosc graniastosłupa
V=Pp·H=27√3/4 ·9=243√3/4 [cm³]