Question on: WAEC Mathematics - 2003
In( ∆ PQR, P\hat{Q}P = 84^°, |Q\hat{P}R |= 43^°) and |PQ| = 5cm. Find /QR/ in cm, correct to 1 decimal place.
A
3.4
B
4.3
C
5.9
D
6.2
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Correct Option: B
Using the sine rule
(\frac{|QR|}{sinP}=\frac{|PQ|}{sinR}<br />
\frac{x}{sin43^o}=\frac{5}{sin53^o}<br />
x = \frac{5\times sin43^o}{sin53^o}<br />
=\frac{5\times 0.6820}{0.7986}<br />
=4.3)
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