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Byju's Answer
Standard IX
Mathematics
Volume of a Prism
Let a →, b →,...
Question
Let
a
→
,
b
→
,
c
→
be three non-coplanar vectors such that
a
→
b
→
c
→
=
24
and
a
→
×
b
→
=
6
.
Then the height the parallelopiped formed by
a
→
,
b
→
,
c
→
with
a
→
and
b
→
as two adjacent edges of the base, is ____________.
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Solution
Given
a
→
b
→
c
→
=
24
a
→
×
b
→
=
6
when
a
→
and
b
→
are two adjacent edges of the base
∴
Area of Base is
a
→
×
b
→
=
6
.
i.e c will represent height
Since Volume is given by
a
→
b
→
c
→
=
24
i
.
e
a
→
×
b
→
·
c
→
=
24
i
.
e
a
→
×
b
→
·
c
→
=
24
i
.
e
6
×
c
→
=
24
i
.
e
c
→
=
4
.
i.e height of the parallelepiped is 4.
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Similar questions
Q.
If a, b, c are three non-coplanar vectors such that volume of parallelopiped formed with a, b, c, as coterminous edges is equal to volume of parallelopiped formed with
a
×
b
,
b
×
c
,
c
×
a
as coterminous edges, then:
Q.
Let
→
a
,
→
b
,
→
c
are the three vectors such that
|
→
a
|
,
=
|
→
b
|
=
|
→
c
|
=
2
and angle between
→
a
and
→
b
is
π
3
,
→
b
and
→
c
is
π
3
and
→
a
and
→
c
is
π
3
. Now Match the following
Column - I
Column - II
(A)
If
→
a
,
→
b
,
→
c
represents adjacent edges of parallelopiped then its volume is
(p)
2
√
2
√
3
(B)
If
→
a
,
→
b
,
→
c
represents adjacent edges of parallelopiped then its height is
(q)
2
√
2
3
(C)
If
→
a
,
→
b
,
→
c
represents adjacent edges of tetrahedron then its volume is
(r)
4
√
2
(D)
If
→
a
,
→
b
,
→
c
represents adjacent edges of tetrahedron then its height is
(s)
√
2
3
Q.
The edges of a parallelopiped are of unit length and are parallel to non-coplanar unit vectors
a
,
b
,
c
such that
a
.
b
=
a
.
c
=
b
.
c
=
1
2
.
Then the volume of the parallelopiped is
Q.
If
→
a
,
→
b
,
→
c
are three non-coplanar vectors such that volume of parallelopiped formed with
→
a
,
→
b
,
→
c
as coterminous edges is equal to volume of parallelopiped formed with
→
a
×
→
b
,
→
b
×
→
c
,
→
c
×
→
a
as coterminous edges, then which of the following is/are correct
?
Q.
Let
→
a
,
→
b
,
→
c
be three vectors such that
|
→
a
|
=
|
→
b
|
=
|
→
c
|
=
4
and angle between
→
a
and
→
b
is
π
/
3
,
angle between
→
b
and
→
c
is
π
/
3
and angle between
→
c
and
→
a
is
π
/
3.
The height of the parallelopiped whose adjacent edges are represented by the vectors
→
a
,
→
b
and
→
c
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