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im.1.21.3 Triangle Angle Sum another way (20)

Author:mark vasicek

Attribution

Illustrative Mathematics, Geometry, unit 1, section 21One Hundred Eightyuhttps://im.kendallhunt.com/HS/teachers/2/1/21/index.htmlLicensed under the Creative Commons Attribution 4.0 license, https://creativecommons.org/licenses/by/4.0/

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