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Mathematics
Mathematics
Problem
The co-ordinates of points
A
,
B
,
C
,
D
A, B, C, D
A
,
B
,
C
,
D
are
(
a
,
2
,
1
)
(a, 2, 1)
(
a
,
2
,
1
)
,
(
1
,
−
1
,
1
)
(1, -1, 1)
(
1
,
−
1
,
1
)
,
(
2
,
−
3
,
4
)
(2, -3, 4)
(
2
,
−
3
,
4
)
and
(
a
+
1
,
a
+
2
,
a
+
3
)
(a+1, a+2, a+3)
(
a
+
1
,
a
+
2
,
a
+
3
)
respectively. If
A
B
=
5
AB = 5
A
B
=
5
and
C
D
=
6
CD = 6
C
D
=
6
, then
a
=
a =
a
=
(a) 2 (b) 3 (c)
−
2
-2
−
2
(d)
−
3
-3
−
3
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