pls help ill mark as brainliest
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a.Let l, b, h be the original dimensions
New dimensions = (1.4 l), (1.4 b), (1.4 h)
New total surface area = 2(lb + bh + hl) = 1.96 × 2(lb + bh + lh)
⇒ 96 % increase in the total surface area.
b.The space occupied by an object solid body
is called the volume of the particular object solid body volume is always
measured in cubic unit.
Given:
Dimension of matchbox =4cm×2.5cm×1.5cm
l=4cm,b=2.5cm & h=1.5cm
Volume of cuboid =(l×b×h)
Volume of one matchbox = Volume of cuboid
Volume of one matchbox =4×2.5×1.5=15cm3
Volume of a packet containing 12 such boxes = 12× volume of one match box
(12×15)cm3=180cm3
Hence, the volume of a packet containing 12
such boxes=180cm3
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