Why is this true?:

I already know the answer, i just can't think of how to explain why. Is there a postulate that goes with it or a theorem??

1)What is true of the measures of any two angles labeled with the same number? Explain how you know.

(i'll draw a picture of it in a second)

Question

Why is this true?:

I already know the answer, i just can't think of how to explain why. Is there a postulate that goes with it or a theorem??

1)What is true of the measures of any two angles labeled with the same number? Explain how you know. 

(i'll draw a picture of it in a second)

anonymous · Answer

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directrix · Answer

These angles are known as vertical angles.

directrix · Answer

Read about the theorem you mentioned here: http://hotmath.com/hotmath_help/topics/vertical-angles-theorem.html @ashley_king