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Byju's Answer
Standard VIII
Mathematics
Construction of Isosceles Triangle Whose Base and Corresponding Altitude Are Given
Find the leng...
Question
Find the length of the longest rod that can be placed in a room 12 m long, 9 m broad and 8 m high.
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Solution
Length
of
the
room
=
12
m
Breadth
=
9
m
Height
=
8
m
Since
the
room
is
cuboidal
in
shape
,
the
length
of
the
longest
rod
that
can
be
placed
in
the
room
will
be
equal
to
the
length
of
the
diagonal
between
opposite
vertices
.
Length
of
the
diagonal
of
the
floor
using
the
Pythagorus
theorem
=
l
2
+
b
2
=
(
12
)
2
+
(
9
)
2
=
144
+
81
=
225
=
15
m
i
.
e
.
,
the
length
of
the
longest
rod
would
be
equal
to
the
length
of
the
diagonal
of
the
right
angle
triangle
of
base
15
m
and
altitude
8
m
.
Similarly
,
using
the
Pythagorus
theorem
,
length
of
the
diagonal
=
15
2
+
8
2
=
225
+
64
=
17
m
∴
The
length
of
the
longest
rod
that
can
be
placed
in
the
room
is
17
m
.
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