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anonymous

  • one year ago

NEED HELP SOS Find an integer, x, such that 5, 10, and x represent the lengths of the sides of an obtuse triangle. A. 4 B. 5 C. 6 D. 11

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  1. welshfella
    • one year ago
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    In an obtuse triangle c^2 > a^2 + b^2

  2. welshfella
    • one year ago
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    so if we take c = 10 what inequality can we write?

  3. welshfella
    • one year ago
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    10^2 > 5^2 + b^2 can you solve this for b^2? then for b?

  4. anonymous
    • one year ago
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    100 + 25

  5. welshfella
    • one year ago
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    not +

  6. anonymous
    • one year ago
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    100 > 25 + 36 for 6

  7. anonymous
    • one year ago
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    i thought the asnwer would be 6

  8. welshfella
    • one year ago
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    b^2 < 100 - 25 b^2 < 75

  9. welshfella
    • one year ago
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    b < sqrt75 b < 8.66

  10. anonymous
    • one year ago
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    im really confused

  11. welshfella
    • one year ago
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    b cannot be 4 or 5 because that would not make a triangle and 11 > 8.66 therefore the answer is 6

  12. anonymous
    • one year ago
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    8 isnt an option

  13. anonymous
    • one year ago
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    oh i get it

  14. anonymous
    • one year ago
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    i have one more question

  15. welshfella
    • one year ago
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    ok

  16. anonymous
    • one year ago
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    how do i find an acute triangle

  17. anonymous
    • one year ago
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    Using Pythagorean inequalities, determine which set of the given three sides produces an acute triangle.

  18. welshfella
    • one year ago
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    for an acute angle , if c is the longest side, c^2 < a^2 + b^2

  19. anonymous
    • one year ago
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    3, 4, 5 6,12,20 4,6,10, 5,12,18 ALL NUMBERS TO SQUARE ROOT

  20. welshfella
    • one year ago
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    - and dont forget for all triangles the sum of any 2 sides must exceed the length of the other side

  21. anonymous
    • one year ago
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    what

  22. anonymous
    • one year ago
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    i dont know how to do it cause the numbers are squared

  23. welshfella
    • one year ago
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    what exactly is the second question?

  24. anonymous
    • one year ago
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    Using Pythagorean inequalities, determine which set of the given three sides produces an acute triangle.

  25. anonymous
    • one year ago
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    6 minutes till time runs out on this question:/

  26. welshfella
    • one year ago
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    well the first one is a right angled triangle because 5^2 = 3^2 + 4^2

  27. anonymous
    • one year ago
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    what about C

  28. anonymous
    • one year ago
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    rembember all the numbers are squared

  29. welshfella
    • one year ago
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    the 2nd is not a triangle? can you see why? neither is the third why?

  30. anonymous
    • one year ago
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    4, 6,10 4x4 = 16 6x6=36

  31. welshfella
    • one year ago
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    and 10^2 = 100 but 4+6 = 10 so its not a triangle..

  32. anonymous
    • one year ago
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    oh

  33. welshfella
    • one year ago
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    you cant draw a triangle with sides this length

  34. welshfella
    • one year ago
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    |dw:1436815512380:dw|

  35. welshfella
    • one year ago
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    - they give a straight line

  36. anonymous
    • one year ago
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    i see

  37. welshfella
    • one year ago
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    also 18 > 5 + 12 so that's not a triangle also

  38. anonymous
    • one year ago
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    i got the answer wrong

  39. welshfella
    • one year ago
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    the only one which is a triangle is A but that's a right-angled triangle because it fits the Pythagoras theorem.

  40. welshfella
    • one year ago
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    what is the correct answer?

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