Question

A área total de um cubo é 54 cm² então o volume desse cubo é?​

Answer 1

$\Large\boxed{\begin{array}{l}\sf A_t=6\cdot a^2\\\sf 54=6a^2\\\sf a^2=\dfrac{54}{6}\\\\\sf a^2=9\\\sf a=\sqrt{9}\\\sf a=3\,cm\\\sf V=a^3\\\sf V=3^3\\\sf V=27\,cm^3\blue{\checkmark}\end{array}}$