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Authoritative PPT Summary
"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT Courseware (Lesson 2)
Part One: Learning Objectives
Definition of exterior angles of a triangle
The relationship between the exterior angles of a triangle
The sum of the exterior angles of a triangle
Sum of interior angles theorem of triangles PPT, part 2 content: Understanding new knowledge
Knowledge points Definition of exterior angles of a triangle
Definition of exterior angle of a triangle: As shown in the figure, ∠ACD is the angle formed by the extension of one side BC of △ABC and the other adjacent side CA. Such an angle is called the exterior angle of the triangle.
Knowledge points The relationship between the exterior angles of a triangle
1. Corollary to the sum of the interior angles of a triangle theorem (Exterior angle theorem of a triangle): The exterior angle of a triangle is equal to the sum of its two non-adjacent interior angles.
2. An exterior angle of a triangle is greater than any interior angle that is not adjacent to it: Function: used to prove the inequality of angles.
Sum of interior angles theorem of triangles PPT, Part 3 content: Class summary
1. The exterior angle of a triangle is essentially the complementary angle of an interior angle of the triangle. The vertex of the exterior angle of a triangle is the vertex of the triangle, one side is one side of the interior angle of the triangle, and the other side is the reverse extension of the other side of the interior angle.
2. Corollary of the sum of the interior angles of a triangle theorem: ① Two theorems illustrate the relationship between the exterior angles and interior angles of a triangle, one of which is the equality relationship between the exterior angles and the interior angles, and the other is the unequal relationship between the exterior angles and the interior angles. ②When applying the above two theorems, we must pay attention to the key term "non-adjacent".
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"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT download:
"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT download, 12 pages in total. Part 1: Basic knowledge points Knowledge point 1 The sum of the interior angles of a triangle theorem 1. In △ABC, A=B+C, then the correct judgment of the shape of △ABC is (A) A. Right triangle B. Acute...
"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT Courseware (Lesson 1):
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"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT (Lesson 2):
"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT (Lesson 2), 36 pages in total. Part One: Learning Objectives 1. Understand and master the definition of exterior angles of a triangle. (Key points) 2. Master the properties of the exterior angles of a triangle and use the properties of the exterior angles to make simple...