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Byju's Answer
Standard X
Geography
Calculating Areas and Distances
Two cubes are...
Question
Two cubes are joined to form a cuboid. If the total surface area of the
cuboid thus formed is 640 cm 2 , then what is the length of the edge of the
cube?
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Solution
Let
the
length
of
each
edge
of
cube
=
s
cm
Now
,
when
2
cubes
are
joined
end
to
end
,
then
cuboid
is
formed
.
Length
of
cuboid
,
l
=
2
s
breadth
of
cuboid
,
b
=
s
height
of
cuboid
,
h
=
s
TSA
of
cuboid
=
640
cm
2
⇒
2
lb
+
bh
+
hl
=
640
⇒
2
s
×
s
+
s
×
s
+
s
×
2
s
=
320
⇒
2
s
2
+
s
2
+
2
s
2
=
320
⇒
5
s
2
=
320
⇒
s
2
=
64
⇒
s
=
8
So
,
length
of
each
edge
of
cube
=
s
=
8
cm
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