Law of Cosines (opp leg) squared =(adj leg)squared +(adj leg) squared-2(adj leg)(adj leg) cos(angle b/w)
This is your last resort if nothing else works. The formula is easy, but you have to remember all of it.
Ex. triangle w/ 3 cm side and 7 cm side, angle between them is 130 degrees
(z)^2= (3)^2+(7)^2-2(3)(7) cos(130deg)
z=sq, root. 3^2 +7^2- 2(3)(7) cos(130 deg)
z=9.22 cm^2
(z)^2= (3)^2+(7)^2-2(3)(7) cos(130deg)
z=sq, root. 3^2 +7^2- 2(3)(7) cos(130 deg)
z=9.22 cm^2
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