Mathematics
AnabelCrecco
5

Dmitri wants to cover the top and sides of the box shown with glass tiles that are 5mm square. How many tiles does he need? ( The length is 15cm, the width is 20cm and the height is 9cm).

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(1) Answers
Brittneyy

The Surface Area = lw + 2lh + 2wh; The Surface Area = 15*20 + 2*15*9 + 2*20*9; The Surface Area = 300 + 270 + 360; The Surface Area = 570 + 360; The Surface Area = 930cm^2; The surface of glass tile is 5 × 5 = 25 cm^2; Then, 930 ÷ 25 = 37.2; He need 38 tiles to cover the top and sides of the box shown.

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