This activity will show you a way to prove that the angles in a triangle add to 180. 1. Given any triangle with (corner) points A, B, and C, let a, b, and e be the angles of the triangle at A, B, and C, respectively. Consider the line through A parallel to the side BC that is opposite A. What can you say about the 3 adjacent angles at A that are formed by the triangle and the line through A? What can you concude about the sum of the angles in the triangle? opyright/ 2019 Pea Drwaline paralet to IC thgh A

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter1: Vectors
Section1.2: Length And Angle: The Dot Product
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Class Activity 10E Drawing a Parallel Line to Prove That the
Angles in a Triangle Add to 180°
CCSS CCSS SMP3, 8.G.S
This activity will show you a way to prove that the angles in a triangle add to 180°.
1. Given any triangle with (corner) points A, B, and C, let a, b, and e be the angles of the
triangle at A, B, and C, respectively. Consider the line through A parallel to the side BC
that is opposite A.
What can you say about the 3 adjacent angles at A that are formed by the triangle and
the line through A?
What can you conclude about the sum of the angles in the triangle?
Copyright/ 20I9 Pearson Education
Drwa line parallel to
IC though A
2. What if you used a different triangle in part 11 Would you still reach the same conclusion
Transcribed Image Text:Class Activity 10E Drawing a Parallel Line to Prove That the Angles in a Triangle Add to 180° CCSS CCSS SMP3, 8.G.S This activity will show you a way to prove that the angles in a triangle add to 180°. 1. Given any triangle with (corner) points A, B, and C, let a, b, and e be the angles of the triangle at A, B, and C, respectively. Consider the line through A parallel to the side BC that is opposite A. What can you say about the 3 adjacent angles at A that are formed by the triangle and the line through A? What can you conclude about the sum of the angles in the triangle? Copyright/ 20I9 Pearson Education Drwa line parallel to IC though A 2. What if you used a different triangle in part 11 Would you still reach the same conclusion
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