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`        If a and b are perpendicular vectors |a+b|=13 and |a|=5 what is value of |b|=?`
2 years ago

## Answers : (1)

Arun
23343 Points
```							Dear student

(A +B). (A+ B) = A.A + B.B + A.B + B.A
Now
|A+B|² = |A |² + |B |²  {A.B = B.A = 0}
169 = 25 + | B|²
|B| = 12

Regards
Arun (askIITians forum expert)
```
2 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions