Q
,
let
M
=
W
,
we
Ws
where
[WSWWs
I
U
,
Uz
Us
[V
,,
V2
,
V3
Y
Iv
,
V2
Vs
We
can
represent
the
quantity
D
:
D
=
defM
=
W
,
(UcVs-UsV2)
-
Wa(k ivs-
U3V)
+
Ws(U
,
V2-UzV
,
S
=
W
.
/keVs
-
UsVz]
+
Wa
/UsV
,
-
U
,
Us)
+
Ws)
U
.
U2
-
UzV
,
)
=
<W
,,
Wa
,
Ws)
·
[UcVs
-
UsVz
,
UzV
,
-
U
,
Us
,
U
.
U2-UzV
,
>
=
.
(nx
)
Yand
8
he
on
the
Xy-plane
.
Then
EXV
is
in
the
same
direction
as
Dididate
a
pet
Z
11
Project
Foll
=
111
cost
=
Height
We
have
&
I
Note
that
ixt
is
orthogonal
to
the
base
formed
by
it
and
Hence
D
gives
the
height
of
the
parallelopped
formed
by
i
, ,
i
.
&
i
.
/xi)
=
11
will
cost
11
EXT11
Idef
of
dot
product)
=
Volume
of
parallelopped
/
given
Thus
sume
=
Aread-base
=
