5. Determine the length of XY to the nearest tenth of a centimetre.
61°
17.4 cm
Y X
Z
a. 8.4 cm b. 15.2 cm c. 31.4 cm d. 19.9 cm
To get angle XZY=90−61=29°90-61=29°90−61=29°
Using the sine rule ;
17.4Sin90=xSin29\frac {17.4} {Sin 90}=\frac {x} {Sin 29}Sin9017.4=Sin29x
17.41=x0.4848\frac {17.4} {1}=\frac {x} {0.4848}117.4=0.4848x
x=(17.4×0.4848)=8.4cmx=(17.4×0.4848)=8.4cmx=(17.4×0.4848)=8.4cm
XY=8.4cm
a) 8.4 cm Correct
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