Question

given that p = 12 , Q=5 and R= 13 also P+Q=R then the angel between P and Q is​

Answer 1

Answer:

Consider the problem

Let x is the angle between P and Q .

R

=

P

+

Q

∴13=

(5

2

+12

2

+(2×5×12×Cosx))

[∵∣

a

+

b

∣=

a

2

+b

2

+2abcosθ

]

⇒169=169+120cosx

⇒0=120cosx

⇒cosx=0

∴x=90

∘

=

2

π

Answer 2

Answer:

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