If R= P + and R=1P+Q| find the angle between P and Q.
Answers
Answered by
0
When,
P
+
Q
=
R
or
P
−
R
=−
Q
(
P
−
R
).(
P
−
R
)=(−
Q
).(−
Q
)
P
2
+R
2
−2PRcosθ
1
=Q
2
cosθ
1
=1/2 (as P=Q=R)
θ
1
=60
0
When,
P
+
Q
+
R
=0 or
P
+
R
=−
Q
(
P
+
R
).(
P
+
R
)=(−
Q
).(−
Q
)
P
2
+R
2
+2PRcosθ
2
=Q
2
cosθ
2
=−1/2 (as P=Q=R)
θ
2
=120
0
Thus, θ
1
=
2
θ
2
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Answered by
3
Explanation:
Answer:
sin(90)=1
Step-by-step explanation:
sum of three angle of triangle =180
P+Q+R =180
As Q = 90
P+R=180-Q
P+R=180-90
P+R=90
sin(90)=1
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