Given: Total surface area of cube = 5400 sq.cm.
To find: Surface area of all vertical faces of the cube
i. Total surface area of cube = 6l2
∴ 5400 = 6l2
∴ 5400/6 = l2
∴ l2 = 900
ii. Area of vertical faces of cube = 4l2
= 4 x 900 = 3600 sq.cm.
∴ The surface area of all vertical faces of the cube is 3600 sq.cm.