Glass aquarium

How many m2 of glass are needed to produce aquarium with bottom dimensions of 70 cm x 40 cm and 50 cm high?

Correct result:

x =  1.38 m2

Solution:

a=70 cm→ m=70/100  m=0.7 m b=40 cm→ m=40/100  m=0.4 m c=50 cm→ m=50/100  m=0.5 m  S1=a⋅ b=0.7⋅ 0.4=725=0.28 m2  o=2⋅ a+2⋅ b=2⋅ 0.7+2⋅ 0.4=115=2.2 m  S2=c⋅ o=0.5⋅ 2.2=1110=1.1 m2  x=S1+S2=0.28+1.1=6950=6950 m2=1.38 m2

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