Question 1136370
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For your info:  a triangle has no length.



Its sides have lengths.



If you want to ask about the hypotenuse length of this right angled triangle,  it is  10  inches: 



c = {{{sqrt(8^2+6^2)}}} = {{{sqrt(64 + 36)}}} = {{{sqrt(100)}}} = 10.  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <U>ANSWER</U>
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On Pythagorean theorem, see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Pythagorean-theorem/The-Pythagorean-Theorem.lesson>The Pythagorean Theorem</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Pythagorean-theorem/More-proofs-of-the-Pythagorean-Theorem.lesson>More proofs of the Pythagorean Theorem</A>

in this site.