I need help with this please ( I’m not sure if I should use the a^2+b^2=c^2)

Answer:
Do not use [tex]a^{2} + b^{2} = c^{2}[/tex] that's to solve the hypotenuse of a triangle.
The difference is 31 cm³
Step-by-step explanation:
To solve the volume a cube it's a³
5.7³ = 185.193
I'm assuming to round to the nearest whole number so the difference would be
216 - 185 = 31