Question

Pls help. Cindi wants to cover the top and sides of this box with glass tiles that

are 1 cm square. How many tiles will she need?

Answer 1

Surface area of box:

= 2(lb + bh +hl)

= 2(20×15 + 15×9 + 9×20)

= 2(300 + 95 + 180)

= 2 × 575

= 1,150 cm³

Area of tiles:

= 1 × 4 = 4 cm

No of tiles:

= 1,150/4

= 287.5 = 288

Total 288 tiles will be needed

Answer 2

300 square centimeters