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Fact One
You are given 1 angle which is enclosed by 2 equal sides. That means you have an isosceles triangle. The angles opposite the equal sides are equal.
Fact Two
Every triangle has 180°
Step One
Set up the equation using fact one above.
2 equal angles + 116 = 180
2x + 116 = 180
Step Two
Solve the equation
2x + 116 = 180 Subtract 116 from both sides.
2x = 180 - 116
2x = 64 Divide by 2
x = 64/2
x = 32
Conclusion
Each of the equal angles = 32°
E = 32° <<<<< answer