"vertical angle." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/vertical-angle>.
vertical angle. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/vertical-angle
Angles 1 and 3 are vertical angles, as are angles 2 and 4.
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