I have been having a hard time with these...could someone please look over my work...I was very confused on how to solve number 4, I am still attempting it as of right now....maybe someone could help me with that one....
I have been having a hard time with these...could someone please look over my work...I was very confused on how to solve number 4, I am still attempting it as of right now....maybe someone could help me with that one....
I haven't actually checked the work, but it looks like you have applied the equations correctly.
For the fourth one, use the Law of Cosines:
$\displaystyle a^2 = b^2 + c^2 - 2bc \cdot cos(A)$
The other two forms are
$\displaystyle b^2 = a^2 + c^2 - 2ac \cdot cos(B)$
$\displaystyle c^2 = a^2 + b^2 - 2ab \cdot cos(C)$
As you might have guessed, these are generalizations of the Pythagorean Theorem to triangles with arbitrary angles (not just right angles.)
-Dan