Question

what is the surface area of this cube? 9 cm 9 cm 9 cm cm²

Explanation:

Step1: Find the area of one face

The area of one face of a cube is \(s^2\), where \(s = 9\) cm. So, \(A_1=9\times9 = 81\) \(cm^2\).

Step2: Calculate the surface area of the cube

A cube has 6 faces. The surface area \(S\) of a cube is \(6\times A_1\). So, \(S = 6\times81=486\) \(cm^2\).

Answer:

\(486\)