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-Welp-

  • one year ago

How do I solve this?

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  1. -Welp-
    • one year ago
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    |dw:1438527061044:dw| "find the area of the triangle"

  2. Rushwr
    • one year ago
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    is that all ? No anyother angles given >

  3. -Welp-
    • one year ago
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    That's all they gave me to work with

  4. Rushwr
    • one year ago
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    have they atleast mentioned about the left over angles being same or something?

  5. -Welp-
    • one year ago
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    |dw:1438527348097:dw| I got it backwards

  6. -Welp-
    • one year ago
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    *Sorry, I had it backwards

  7. Rushwr
    • one year ago
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    Soo do u want to know the whole procedure or just how to take the angles. !

  8. -Welp-
    • one year ago
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    The whole procedure please

  9. anonymous
    • one year ago
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    You use cosine rule for this right?

  10. Rushwr
    • one year ago
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    That's what I was thinking too ! NOt sure though ! Still thinking ! WOuld you mind helping us @paki

  11. anonymous
    • one year ago
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    \[a^2=b^2+c^2-2bc \cos A\]

  12. anonymous
    • one year ago
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    \[a=\sqrt{12^2+8^2-2(12(8)\cos 81}\]

  13. anonymous
    • one year ago
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    lets see what you get

  14. -Welp-
    • one year ago
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    I got 13.34033668 that doesn't seem right

  15. anonymous
    • one year ago
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    you can verify it with sine rule now that you have 3 sides

  16. amistre64
    • one year ago
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    how would you usually figure out the are of a triangle?

  17. amistre64
    • one year ago
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    |dw:1438530093183:dw|

  18. amistre64
    • one year ago
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    how would we determine the height? do we know any trig functions that we could employ?

  19. triciaal
    • one year ago
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    another approach after using the cosine rule to get the 3rd side use Hero's formula to find the area knowing the 3 sides

  20. triciaal
    • one year ago
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    |dw:1438531174056:dw|

  21. -Welp-
    • one year ago
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    "you can verify it with sine rule now that you have 3 sides" Formula for sine rule? "how would we determine the height? do we know any trig functions that we could employ?" I don't know "another approach after using the cosine rule to get the 3rd side use Hero's formula to find the area knowing the 3 sides " I don't know what I did wrong but I got 177

  22. zepdrix
    • one year ago
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    Formula for Sine Rule:\[\large\rm \frac{a}{\sin A}=\frac{b}{\sin B}\]|dw:1438535217539:dw|

  23. zepdrix
    • one year ago
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    Ya I like that Law of Cosines approach :o

  24. -Welp-
    • one year ago
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    =47.4 ^Is that correct?

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spraguer (Moderator)
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