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What is the lateral surface area of a cuboid?
Solution:
The lateral surface area of a cuboid is the sum of the areas of its 4 faces (excluding the top and bottom face)
A cuboid has six faces.
Area of BFGC and AEHD {each} = $h \times l$
Area of ABFE and CGHD {each} = $b \times h$
Area of ABCD and EFGH (each )=$l \times b$
Therefore, area of all faces =$2(h \times l)+2(b \times h)+2(l \times b)$
=$2(h\times l+b \times h+l \times b)$
=$2(l\times b+b \times h+h \times l)$
It is called total surface area of a cuboid.
Therefore,Lateral surface area of a cuboid $=2(l\times b+b \times h+h \times l)-2(l \times b)$
$=2(b \times h+h \times l)$
Lateral surface area of a cuboid of length $l$, breadth $b$ and height $h$ is $2(b \times h+h \times l)$.
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