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anonymous

  • one year ago

given that a=25 b=43 and c=17, solve triangle abc

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  1. anonymous
    • one year ago
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  2. campbell_st
    • one year ago
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    so are they side measurements or angles measurements..?

  3. anonymous
    • one year ago
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    not sure thats all the question that its asking!!

  4. campbell_st
    • one year ago
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    so the letters in the question are all lower case..?

  5. anonymous
    • one year ago
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    oh ... it looks like this

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  6. campbell_st
    • one year ago
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    ok... that makes more sense, you have been given 2 angles and 1 side

  7. anonymous
    • one year ago
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    oh

  8. campbell_st
    • one year ago
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    lets start with the easy one if angle A = 25 and angle B = 43 what is the measure of angle C..?

  9. anonymous
    • one year ago
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    ummmm... i know im gonna sound dumb! but im not sure :(

  10. campbell_st
    • one year ago
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    here is a diagram |dw:1436219098207:dw|

  11. campbell_st
    • one year ago
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    ok... so the angles in a triangle add to 180 degrees so C = 180 - 25 - 43 what would you say C is..?

  12. anonymous
    • one year ago
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    C=112

  13. campbell_st
    • one year ago
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    great... so you have eliminated 2 answer choices... its between A and B so do you know the law of sines...?

  14. anonymous
    • one year ago
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    not really

  15. campbell_st
    • one year ago
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    you need the law of sines to find a and b |dw:1436219276410:dw|

  16. campbell_st
    • one year ago
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    wow... that makes it hard to answer the question so the law of sines is uses the side and angle measures to find other sides and angles the law you'll need is \[\frac{c}{\sin(C)} = \frac{a}{\sin(A)}\] have you seen that before..?

  17. anonymous
    • one year ago
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    yea yea... but i dont remember a thing!

  18. anonymous
    • one year ago
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    i dont mean to sound mean or anything ! but im on timed test and i have 5 mins left... is it possible if you can help me faster ? thank you

  19. campbell_st
    • one year ago
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    ok... then here is a quick and dirty method to solve the problem... there is this stuff about triangles that says the longest side is opposite the largest angle the shortest side is opposite the smallest angle the middles length side is opposite the middle angle measure so the angles in order of side are Angle C = 112 side c = 17 Angle B = 43 side b = 12,5 or 7.5 Angle A = 25 side a = 12.5 or 7.5 so using the facts about sides and angles... what side matches angle A and which side matches angle A

  20. campbell_st
    • one year ago
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    think about the shortest is opposite the smallest angle

  21. campbell_st
    • one year ago
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    this quick an dirty method eliminates the need for calculations in this question

  22. anonymous
    • one year ago
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    so would the answer be B ??

  23. campbell_st
    • one year ago
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    that would be my guess

  24. anonymous
    • one year ago
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    alright... thank you very much campbell_st !

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