macshooter49 macshooter49
  • 22-05-2022
  • Mathematics
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(50 POINTS) What is the length of YZ in Triangle XYZ? Explain two different methods that could be used to find this length.

50 POINTS What is the length of YZ in Triangle XYZ Explain two different methods that could be used to find this length class=

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fieryanswererft
fieryanswererft fieryanswererft
  • 22-05-2022

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

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