r - promień kuli
r - promień podstawy stożka
l - tworząca stożka
H - wysokość stożka
________________________________________________________
Zadanie 6:
[tex]V=\frac43\pi r^3\\P=4\pi r^2\\P=120\pi\\\\4\pi r^2=120\pi\\4r^2=120 /:4\\r^2=30\\\underline{r=\sqrt{30}}\\\\V=\frac43\pi*(\sqrt{30})^3\\V=\frac43\pi*30\sqrt{30}\\V=4\pi*10\sqrt{30}\\\boxed{V=40\pi \sqrt{30}}[/tex]
Zadanie 7:
[tex]V_k=\frac43\pi r^3 = 36\pi\\\frac43r^3=36 /*\frac34\\r^3=9*3\\r^3=27\\r=3[/tex]
Wysokosc kuli to jej srednica.
[tex]H_k=d=2r\\\boxed{H_k=2*3=6}[/tex]
Wysokosc kuli: 6
[tex]V_s=\frac13 \pi r^2 * H = 36\pi \\\pi *3^2*H=36\pi * 3\\9H=108 /:9\\\boxed{H=12}[/tex]
Wysokosc stożka: 12
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Kula:
r - promień kuli
Stożek:
r - promień podstawy stożka
l - tworząca stożka
H - wysokość stożka
________________________________________________________
Rozwiązanie:
Zadanie 6:
[tex]V=\frac43\pi r^3\\P=4\pi r^2\\P=120\pi\\\\4\pi r^2=120\pi\\4r^2=120 /:4\\r^2=30\\\underline{r=\sqrt{30}}\\\\V=\frac43\pi*(\sqrt{30})^3\\V=\frac43\pi*30\sqrt{30}\\V=4\pi*10\sqrt{30}\\\boxed{V=40\pi \sqrt{30}}[/tex]
Zadanie 7:
[tex]V_k=\frac43\pi r^3 = 36\pi\\\frac43r^3=36 /*\frac34\\r^3=9*3\\r^3=27\\r=3[/tex]
Wysokosc kuli to jej srednica.
[tex]H_k=d=2r\\\boxed{H_k=2*3=6}[/tex]
Wysokosc kuli: 6
[tex]V_s=\frac13 \pi r^2 * H = 36\pi \\\pi *3^2*H=36\pi * 3\\9H=108 /:9\\\boxed{H=12}[/tex]
Wysokosc stożka: 12