17
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not to be republished
 MATHEMATICS
440
Further, note that
| AB|2
uuur
 =
2
2
41
6
35 | BC |
| CA |
=
+
=
+
uuur
uuur
Hence, the triangle is a right angled triangle EXERCISE 10 2
1 Compute the magnitude of the following vectors:
1
1
1
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
;
2
7
3 ;   
3
3
3
a
i
j
k
b
i
j
k
c
i
j
k
= +
+
=
−
−
=
+
−
r
r
r
2