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Thread: sides of a triangle

  1. #1 sides of a triangle 
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    Hi!

    If two sides of the triangle are 19cm and 8 cm, then what is the measure of the third side ?

    Note: This is not my home work or any assignment. Please let me know the answer with the method of solving?

    regards and love,

    kvskvt


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  3. #2  
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    Quote Originally Posted by kvskvt View Post
    Hi!

    If two sides of the triangle are 19cm and 8 cm, then what is the measure of the third side ?
    Whatever you want it to be; well, it must be greater than 0 and less than 27. There is not enough information here to answer the question. You need something else. One of the angles, maybe?


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  4. #3  
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    You need another parameter, like one of the angles, to get a precise answer. Just given like this, the third side could be .
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

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  5. #4  
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    The third side X must be 27cm > X > 11cm. Sum of two sides must be > third side.
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  6. #5  
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    A+B=C . A can be either the shortest line or a line perpendicular to the hypotenuse. B can be considered as the same a the rules of A. C is the hypotenuse (The longest side) .
    To find a side that isn't C (The hypotenuse) the equation is C-B=A
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  7. #6  
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    Quote Originally Posted by jnickson View Post
    a+b=c . A can be either the shortest line or a line perpendicular to the hypotenuse. B can be considered as the same a the rules of a. C is the hypotenuse (the longest side) .
    To find a side that isn't c (the hypotenuse) the equation is c-b=a
    wrong!
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  8. #7  
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    How so?
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  9. #8  
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    A hypotenuse is a feature of a right-angled triangle. There is no reason why the triangle in the OP should be a right-angled triangle. Even if it was one, your equations don't make any sense. If it was a right-angled triangle, the Pythagoras would be , with being the hypotenuse.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

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  10. #9  
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    Thanks for the correction my good sir. I completely forgot about the squares of the formula... Yes, it's a right angled-triangle feature, but i think we could assume that's what his question is referring to as it would be pointless in the case or equilateral or isosceles. Just got back to school after 3 months off, so my maths is a little rusty, but thanks for pointing my mistake out!
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  11. #10  
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    Well, the triangle could have no side equal (scalene triangle), in which case you could use the Sine or Cosine rule.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

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  12. #11  
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    You have actually just found my greatest weakness in maths! triangles are evil
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  13. #12  
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    Nah, only a few rules to know and after that you can work out any problem you'll likely encounter at school. You'll get the hang of it.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
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  14. #13  
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    woah there with the fast replies, hahaha. Gonna learn it all before it comes up on my curriculum next term. Got into maths for As level (To be taken at A level next year) and i got refused the chance to go into Further maths because i got a B when i was set for a high A, but dropped more than half marks on my final test ): . Weird thing is, my friend just got into As level physics with a C when you need a B grade. Freaking school board is two-faced
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