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anonymous

  • one year ago

WILL MEDAL AND FAN! In Triangle ABC, m<A=43 degrees, m<B=62 degrees, and BC=22 in. What is AB to the nearest tenth of an inch?

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  1. butterflydreamer
    • one year ago
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    first draw out a triangle and label the information given to you in the question :)

  2. anonymous
    • one year ago
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    |dw:1433223149189:dw|

  3. anonymous
    • one year ago
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    Like that?

  4. anonymous
    • one year ago
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    @butterflydreamer

  5. butterflydreamer
    • one year ago
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    exactlyyy! :) Good Okay so we want to work out the length AB right? So, before we can do this (by using the sine rule) we have to FIRSTLY work out the angle of C. Hint; Angle sum of a triangle = 180 And since we're given the other two angles, angle C = ?

  6. anonymous
    • one year ago
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    75

  7. butterflydreamer
    • one year ago
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    yes now we can apply the sine rule since we have two angles and their corresponding sides :) |dw:1433223771770:dw|

  8. butterflydreamer
    • one year ago
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    Sine rule to find the length of a side is given by the formula: |dw:1433223826060:dw|

  9. anonymous
    • one year ago
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    So how do I figure that out?

  10. butterflydreamer
    • one year ago
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    well.. we have this formula: |dw:1433223969779:dw|

  11. butterflydreamer
    • one year ago
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    also when you plug it into the calculator, remember the question asks for the length of AB to the nearest tenth of an inch... meaning round it to 1 decimal point. Then you're all done :)

  12. anonymous
    • one year ago
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    Do you know of a online calculator that does that because mine doesn't let me put all that in?

  13. butterflydreamer
    • one year ago
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    .. you don't have a "sin" button on your calculator? LOL For questions like these, you'll definitely need one of these scientific calculators :) Anyway here is one: https://www.google.com.au/search?q=scientific+calculator+online&oq=scientific+calculator+online&aqs=chrome..69i57.4559j0j7&sourceid=chrome&es_sm=93&ie=UTF-8

  14. anonymous
    • one year ago
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    I get 10.2 and my calculator has sin but it wouldn't let me put the 75 after.

  15. butterflydreamer
    • one year ago
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    oh lol.. you're close. remember... if the number after 2 is 5 or above, we round up. SO 2 will become 3. Therefore it will be 10.25 and we round it to 1 dp, therefore 10.3

  16. anonymous
    • one year ago
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    My choices are 28.5 in 15.6 in 14.1 in 31.2 in What do I do?

  17. butterflydreamer
    • one year ago
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    oh.. hmm give me a minute.. maybe i did something wrong

  18. butterflydreamer
    • one year ago
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    i just re-did the question and i still end up with 10.3 in SO maybe you made a typo in the question?

  19. anonymous
    • one year ago
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    Nope I just double checked it matches exactly with my question.

  20. anonymous
    • one year ago
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    @butterflydreamer

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