Answer:
47.16 Square centimeters
Step-by-step explanation:
Width=7.2cm
Length =19cm
Height =32cm
Surface Area=2(LW+LH+WH)
=2(19*7.2+19*32+7.2*32)
Surface Area [tex]=1950.4 cm^2[/tex]
When the height is increased by 0.9cm
Height =32.9cm
Surface Area=2(LW+LH+WH)
=2(19*7.2+19*32.9+7.2*32.9)
Surface Area [tex]=1997.56 cm^2[/tex]
Difference in Surface Area=1997.56-1950.4
=47.16 Square centimeters
An alternative way is to calculate the surface area dealing with the height only using the height difference,
Difference=2(LH+WH)
=2(19*0.9+7.2*0.9)
=47.16 Square centimeters
