A triangle is equilateral if, and only if, it has three congruent angles.
2 answers:
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That is your answer if it is wrong i will try to fix it
My work shown is how to get x. now that you have x plug it into the equation.
To test your answer add both 51 and 39, and you should get 90 (the measurement of a right angle)
To test your answer add both 51 and 39, and you should get 90 (the measurement of a right angle)