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NDA Math Vector Algebra
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© examsnet.com
Question : 35
Total: 101
If in a right – angled triangle ABC , hypotenuse AC=p, then what is
→
AB
→
AC
+
→
BC
.
→
BA
+
→
CA
.
→
CB
equal to?
[NDA I 2019]
p
2
2 p
2
p
2
2
p
Validate
Solution:
(A)
Given AC = P,
Now
→
AB
.
→
AC
+
→
BC
.
→
BA
+
→
CA
.
→
CB
=
→
AC
. (
→
AB
+
→
BC
) +
→
BC
.
→
BA
=
→
AC
.
→
AC
+ 0 (
→
BC
⊥
→
BA
)
=
|
→
AC
|
2
=
p
2
© examsnet.com
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