[tex]\large\text{$O ~volume ~aproximado ~da ~pe\c{c}a ~ \Rightarrow ~V \approx ~293,06 ~cm^3 $}\\\\\\\large\text{$Letra ~b) ~ 300 ~cm^3 $}[/tex]
Calcular um tronco de cone,
[tex]V = \dfrac{1}{3}~. ~\pi~. ~h ~. ~( R^2 + Rr + r^2)\\\\\\V = \dfrac{1}{3}~. ~3,14~. ~5 ~. ~( 4^2 +4 . 2 + 2^2)\\\\\\V = \dfrac{1}{3}~. ~15,7~. ~( 28)\\\\\\V = \dfrac{1}{3}~. ~439,6\\\\\\V \approx 146,53~cm^3\\\\\\[/tex]
Como a peça é formada por dois troncos de cones, multiplicar por 2.
[tex]V \approx 146,53 ~. ~2\\\\\\V \approx 293,06 ~cm^3\\\\\\[/tex]
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