Given , where , , , and , what's the length of a?

The triangle doesn't exist, because the hypotenuse cannot be the same length as one of the other sides. But when you put it in the first cosine theorem, it gives an answer

???

- April 8th 2010, 06:48 PMchengbinWhy does first cosine theorem work for a triangle that doesn't exist?
Given , where , , , and , what's the length of a?

The triangle doesn't exist, because the hypotenuse cannot be the same length as one of the other sides. But when you put it in the first cosine theorem, it gives an answer

??? - April 8th 2010, 06:55 PMharish21
- April 8th 2010, 06:56 PMskeeter
what is the "first cosine theorem" ?

never heard of it. - April 8th 2010, 07:36 PMchengbin
Umm, just realized that this doesn't exist (???)

What I learned was