Andy C. answered • 10/06/17

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angle #1 = 30

angle #1 = angle 2

By substitution, you can plug 30 into the second equation to get angle #2 = 30.

That completes the proof.

You can also use the Transitive Property of equality which states that if

X = Y and Y = Z , then X = Y = z. That is if one number is equal to a second number,

and the second number is equal to a third number, then they must all be the same.

Therefore, 30 = angle #1 = angle #2