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Question

In ΔPQR, right angled at Q, PQ=3 cm and PR=6 cm. Determine P and R.

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Solution

From the figure, we have

cosP=adjacent sideHypotenuse=36=12

We know that, cos60=12

cosP=cos60
P=60

PQR is right angles at Q
Q=90

InPQR,

P+Q+R=180

60+90+R=180

150+R=180

R=180150

R=30

P=60,R=30

927239_967805_ans_d7665758e5ca4dcf98a0bdec93c76523.png

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