In angle PQR,Q=90 degrees, PQ=12cm, QR=5cm. write down the value of each of the following 1.1 sin P
1.2 cos P
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Step-by-step explanation:
MATHS
In right angled triangle PQR, if ∠Q=90
∘
,PR=5,QR=4 then find PQ and hence find tanR.
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ANSWER
R.E.F.image
In △PQR,∠PQR=90
∘
BY Pythagoras theorem,
PR
2
=PQ
2
+QR
2
⇒(5)
2
=PQ
2
+(4)
2
⇒(5)
2
−(4)
2
=PQ
2
⇒PQ
2
=25−16
⇒PQ
2
=9
⇒PQ=
9
⇒PQ=3
tanR=
QR
PQ
=
4
3
.
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