Odpowiedź:
z.5
P = 0,5* 12*12*sin 120° = 72*sin 60° = 72*[tex]\frac{\sqrt{3} }{2}[/tex] = 36 √3
z.6
r = 4 cm
l =2*4 cm = 8 cm
Pc = Pp + Pb = π r² + π r*l = π*4² + π*4*8 = 16 π + 32 π = 48 π
Pc = 48 π cm²
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z.7
c = 2π*r = 8 cm ⇒ r = [tex]\frac{4}{\pi }[/tex] cm
h = 0,5* c = 4 cm
V = Pp*h = π r²* h = π *([tex]\frac{4}{\pi }[/tex] )² * 4 = [tex]\frac{64}{\pi }[/tex]
V = [tex]\frac{64}{\pi }[/tex] cm³
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Szczegółowe wyjaśnienie:
