You need to know atleast 2 of three sides from a triangle, or 1 side and 1 angle of a triangle. Then you can use trigonometry to find the angle needed.
83deg is the value of angle x. Thanks!
1. 5 -4x =6 +2x
+4x. +4x
5=6. +6x
-6 -6
-1 = 6x
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6. 6
-6=x
2. 9 - 2x = 7x
+2x. +2x
9 = 9x
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9. 9
1 = x