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kenneyfamily Group Title

If A=42.2degrees, B= 13.6degrees, and a=41.3, find area of triangle ABC

  • 2 years ago
  • 2 years ago

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  1. jayz657 Group Title
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    we need to see how the triangle looks like otherwise we cant say anything about it

    • 2 years ago
  2. zepdrix Group Title
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    |dw:1353222533411:dw| Hmm i don't think it really matters what it looks like :D we have 3 pieces, angle angle side, so we should be able to figure something out. hmmmmmmmm This is not drawn to scale, so my bad :3 just to give us a rough idea. Angle B should be much smaller though :)

    • 2 years ago
  3. zepdrix Group Title
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    Area, hmmmmmmmm I'm trying to rememberrrrr :3

    • 2 years ago
  4. jayz657 Group Title
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    area of triangle = bh/2 how do you know what the height is?

    • 2 years ago
  5. kenneyfamily Group Title
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    nope :(

    • 2 years ago
  6. zepdrix Group Title
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    We could use the information we have, solve for the missing sides using the law of sines or cosines or something, and then apply heron's formula... I'm not sure that is the most efficient way though XD hehe

    • 2 years ago
  7. kenneyfamily Group Title
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    a)138.8 b)327.4 c)493.8 d)246.9 those are my choices

    • 2 years ago
  8. Dido525 Group Title
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    @zepdrix : Just use Tan to find the height and then use the triangle area formula.

    • 2 years ago
  9. Dido525 Group Title
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    Ohh wait. It's not a right angle triangle.

    • 2 years ago
  10. zepdrix Group Title
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    Yah :c

    • 2 years ago
  11. Dido525 Group Title
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    Use the law of sines then. Lot easier.

    • 2 years ago
  12. Dido525 Group Title
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    |dw:1353223094929:dw|

    • 2 years ago
  13. Dido525 Group Title
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    Solve for b which is the height and then you have everything else.

    • 2 years ago
  14. kenneyfamily Group Title
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    36.292 is the height right?

    • 2 years ago
  15. kenneyfamily Group Title
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    is 41.3 the base?

    • 2 years ago
  16. kenneyfamily Group Title
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    hmm thats not right

    • 2 years ago
  17. jayz657 Group Title
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    we do not know the height so use this formula Area = 1/2 ab sin(c) we need a side so use law of sines 41.3/sin(42.2) = b /sin(13.6) b = 14.4575 angle c = 180 - 42.2 - 13.6 = area = 1/2(41.3)(14.4575)sin(124.2) area = 246.93 so is D

    • 2 years ago
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