Practice Set 9.1
1. Length, breadth and height of a cuboid shape box of medicine is 20cm, 12 cm and 10 cm
respectively. Find the surface area of vertical faces and total surface area of this box.
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Answer:
T. S. A of cuboid=2(lb + bh+ hl)
=2(20×12+12×10+10×20)
=2(240+120+200)
=2(560)
=1120 ans
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