Glass aquarium

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

Correct answer:

x =  1.38 m2

Step-by-step explanation:

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=257=0.28 m2  o=2 a+2 b=2 0.7+2 0.4=511=2.2 m  S2=c o=0.5 2.2=1011=1.1 m2  x=S1+S2=0.28+1.1=1.38 m2

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