Answer :

heyDB
V=π r^2h/3

V = π r 5^2 16/3

Raise 5 to the power of 2 to get 25.
V=π*25*16/3

Move 25 to the left of the expression π⋅25.
V=25*π*16/3

Multiply 25 by π to get 25π.
V=25π*16/3

Multiply 25π by 163 to get 25π(16/3).
V=25π(16/3)

Simplify

Multiply 16 by 25 to get 400. 
V=(400/3)π 

Combine 400/3 and π/1 to get 400π/3.


V=400π/3 
V≈418.8790


Panoyin
V = 1/3πr²h
V = 1/3(3.14)(5)²16
V = 1/3(3.14)(25)(16)
V = 1/3(3.14)(400)
V = 1/3(1256)
V ≈ 418.67ft³

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