Question: Lesson Cool Down: Triangle Angle Sum a Third Way Elena wants to prove that the measures of the 3 angles in a triangle always

Lesson Cool Down: Triangle Angle Sum a Third Way Elena wants to

Lesson Cool Down: Triangle Angle Sum a Third Way Elena wants to prove that the measures of the 3 angles in a triangle always sum to 180 degrees. She starts by using rigid motions to rotate triangle ABC 180 degrees around 2 midpoints. 9 C D bo B B Explain how Elena labeled her diagram and finish her proof. MLA tmB+m < < = 180 A E bo 9 C

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