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8th Grade Math 11.2a, Sum of the Angle Measures in a Triangle
There is a special relationship between the measures of the interior angles of a triangle. The sum of the 3 angles will always be 180 degrees, no matter the shape or size of the triangle. We draw a triangle, label the vertices, cut it out. By tearing off each corner of the triangle, we arrange the vertices around a point to show they form a 180° straight line. We introduce the Triangle Sum Theorem. The interior measures of a triangle are supplementary. There can only be one right angle in a triangle, so the sum of the other 2 acute angles are complimentary.

8th Grade Math Course Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGXnc3q2i4u3GMqVHYBFMz56

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Textbook: Go Math! Student Interactive Worktext Grade 8 2018 Student Edition
Publisher : HOUGHTON MIFFLIN HARCOURT; Student edition (April 28, 2017)
Language: ‎English
2018 copyright
ISBN-13 : 978-1328761071
Item Weight : 2.85 pounds
Paperback : 608 pages
Product dimensions : 8.4 x 1.1 x 10.7 inches
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