SOLUTION: determined the total surface area of a box that is 20 cm wide 30 cm long and 40 cm tall

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Question 691485: determined the total surface area of a box that is 20 cm wide 30 cm long and 40 cm tall
Answer by mouk(232) About Me  (Show Source):
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Box is 20 cm wide x 30 cm long x 40 cm tall, so there are:
2 x sides of size 20 x 30
2 x sides of size 30 x 40
2 x sides of size 20 x 40
So total surface area is
= (2 x 20 x 30) + (2 x 30 x 40) + (2 x 20 x 40)
= 1200 + 2400 + 1600
= 5200 sq cm