Respuesta :

First Method:

Using cosine rule:

[tex]\rightarrow \sf cos(30 ) = \dfrac{YZ}{12}[/tex]

[tex]\rightarrow \sf YZ = 12cos(30 )[/tex]

[tex]\rightarrow \sf YZ = 6\sqrt{3}[/tex]

[tex]\rightarrow \sf YZ = 10.4[/tex]

Second Method:

First find XY using sine rule:

[tex]\rightarrow \sf sin(30)=\dfrac{XY}{12}[/tex]

[tex]\rightarrow \sf XY = 12sin(30)[/tex]

[tex]\rightarrow \sf XY =6[/tex]

Then use Pythagoras Theorem:

⇒ XY² + YZ² = XZ²

⇒ (6)² + YZ² = 12²

⇒ YZ² = 144 - 36

⇒ YZ = √108

YZ = 6√3

⇒ YZ = 10.4