Resposta:

Olá!

Volume do cone:

[tex]V = \frac{1}{3}(\pi *r^2*h)[/tex]

1)

r = 5 cm ; h = 12 cm ; π = 3

[tex]V = \frac{1}{3}( 3*5^2*12)[/tex]

[tex]V = \frac{1}{3}( 3*25*12)[/tex]

[tex]V = \frac{1}{3}( 75*12)[/tex]

[tex]V = \frac{1}{3}( 900)[/tex]

V = 300 cm³

2)

r = 6 cm ; h = 12 cm ;  π = 3

[tex]V = \frac{1}{3}( 3*6^2*12)[/tex]

[tex]V = \frac{1}{3}( 3*36*12)[/tex]

[tex]V = \frac{1}{3}( 108*12)[/tex]

[tex]V = \frac{1}{3}( 1296)[/tex]

[tex]V = \frac{1}{3}( 1296)[/tex]

V = 492 cm³