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Lesson 13: Angles in a Triangle Part 2 1. Is there a triangle with two right angles? Explain your reasoning. 2. For each triangle, calculate the missing angle. 3. What is the sum of the measures of angles , , , and Unit 3: Rigid Transformations and Congruence Lesson 13: Angles in a Triangle Part 2 in this quadrilateral? 4. a. What is the measure of angle in triangle b. Find the measures of the angles , , and ? Explain. in this picture. c. Find the sum of the measures of angles , , and . Unit 3: Rigid Transformations and Congruence Lesson 13: Angles in a Triangle Part 2 d. Triangle is laid out on the floor. A person starts walking in the middle of segment toward , then turns and walks to , turns again and walks to , and turns one more time to return to the starting place. How many degrees has the person turned? How does this relate to your answer to a? 5. In the picture, line is parallel to line a. Explain why is congruent to . b. Explain why is congruent to . c. Make a conclusion that in . , 6. Diego has created this picture using a geometry computer program: Unit 3: Rigid Transformations and Congruence Lesson 13: Angles in a Triangle Part 2 . Diego notices that these angles add up to more than 180 degrees. What explanation could there be for why the angles in triangle do not add up to 180 degrees? Explain your reasoning. Unit 3: Rigid Transformations and Congruence Lesson 13: Angles in a Triangle Part 2