# Thread: sides of a triangle

1. 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. Originally Posted by kvskvt
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?

4. You need another parameter, like one of the angles, to get a precise answer. Just given like this, the third side could be .

5. The third side X must be 27cm > X > 11cm. Sum of two sides must be > third side.

6. 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

7. Originally Posted by jnickson
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!

8. How so?

9. 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.

10. 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!

11. Well, the triangle could have no side equal (scalene triangle), in which case you could use the Sine or Cosine rule.

12. You have actually just found my greatest weakness in maths! triangles are evil

13. 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.

14. 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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