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Itsyacoolgrl

  • one year ago

What is the length of AC?

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  1. Itsyacoolgrl
    • one year ago
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    |dw:1434376010021:dw|

  2. epicteatime
    • one year ago
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    hmm

  3. epicteatime
    • one year ago
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    well this is hypothenuse I think

  4. epicteatime
    • one year ago
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    10 is the longest side, so we add those 2 I think

  5. epicteatime
    • one year ago
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    oh wait, not add, subtract

  6. MrNood
    • one year ago
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    you have 2 right angle triangles of which oyu know 2 sides Use Pythagoras to work out the 3rd side of each

  7. MrNood
    • one year ago
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    @Epicteatime please stop there .. it is not adding or subtracting....

  8. epicteatime
    • one year ago
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    isn't it 6.61?

  9. epicteatime
    • one year ago
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    And yeah, it was Pythagoras xD sorry

  10. epicteatime
    • one year ago
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    Im doing hypotenuse in my Algebra class so I got it mixed up xD

  11. Itsyacoolgrl
    • one year ago
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    No offense @Epicteatime , I appreciate your help but I would rather @MrNood help me

  12. MrNood
    • one year ago
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    |dw:1434376275460:dw| use Pythagoras to find a and b then add them to get th eanswer

  13. Itsyacoolgrl
    • one year ago
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    a^2 + b^2 = c^2 I can never figure out where I plug in the numbers though

  14. MrNood
    • one year ago
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    c is always the longest side but don't confuse a and b in YOUR equation with those in my diag take each triangle: |dw:1434376491882:dw| |dw:1434376528838:dw|

  15. Itsyacoolgrl
    • one year ago
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    So its a^2 + 6.5^2 = 7.5^2 in the first one and the second one is a^2 + 6.5^2 = 10?

  16. MrNood
    • one year ago
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    yes (I assume you mean 10^2 in th second)

  17. Itsyacoolgrl
    • one year ago
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    Yes :)

  18. Itsyacoolgrl
    • one year ago
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    So then its a + 42.25 = 56.25 and a + 42.25 = 100

  19. MrNood
    • one year ago
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    yes - so get the 2 different values for a - and add them together

  20. MrNood
    • one year ago
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    sorry NO you have missed out the a SQUARED in your formula

  21. Itsyacoolgrl
    • one year ago
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    ok, um what do I square?

  22. Itsyacoolgrl
    • one year ago
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    ....

  23. MrNood
    • one year ago
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    So then its a^2 + 42.25 = 56.25 and a^2 + 42.25 = 100 so you need to solve for a^2 then take sqrt to find a

  24. Itsyacoolgrl
    • one year ago
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    So do I subtract 42.25 from 56.25 and 42.25 from 100 and square the answer?

  25. MrNood
    • one year ago
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    almost but you sqrt the answer (not square it)

  26. MrNood
    • one year ago
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    a^2 + 42.25 = 56.25 a^2 = 56.25-42.25 a = sqrt(14)

  27. Itsyacoolgrl
    • one year ago
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    sqrt(14) = 3.74

  28. MrNood
    • one year ago
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    and do the same for the other equation a^2 + 42.25 = 100 a=?

  29. Itsyacoolgrl
    • one year ago
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    57.75

  30. MrNood
    • one year ago
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    no

  31. Itsyacoolgrl
    • one year ago
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    isn't 100- 42.25= 57.75?

  32. MrNood
    • one year ago
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    a^2 + 42.25 = 56.25 a^2 = 56.25-42.25 a = sqrt(14) use the same method....... a^2 + 42.25 = 100 a=?

  33. Itsyacoolgrl
    • one year ago
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    a^2 + 42.25 = 100 a^2 = 100 - 42.25 a= sqrt (57.75)

  34. Itsyacoolgrl
    • one year ago
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    a=7.59

  35. MrNood
    • one year ago
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    ok - that's correct so now add the 2 separate values for a to get length AC

  36. Itsyacoolgrl
    • one year ago
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    So 3.74 + 7.59 = 11.33

  37. MrNood
    • one year ago
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    :-)

  38. Itsyacoolgrl
    • one year ago
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    Thank you! :D

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