Calculate the total surface area of the outside of an open box which has a base measuring 8 cm by 4 cm and a height of 5 cm.
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Answer:
l = 8cm
b = 4cm
h = 5cm
total surface area = 2(lb+bh+lh)
total surface area = 2(32+20+40)
total surface area = 2(92)
total surface area = 184
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