"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 Courseware (Lesson 1), 21 pages in total.

Part One: Learning Objectives

Sum of interior angles of triangles, properties and applications

Relationship between two acute angles of a right triangle

Sum of interior angles theorem of triangles PPT, part 2 content: Understanding new knowledge

Knowledge points: Sum properties of interior angles of triangles

Summarize

How to judge the shape of a triangle: (1) You can look at the size of the largest angle in the triangle: the largest angle is an acute angle, and the triangle is an acute triangle; the largest angle is a right angle, and the triangle is a right triangle; the largest angle is an obtuse angle, and the triangle is an obtuse triangle ． (2) It can also be judged by the proportional relationship of the angles: the sum of the proportions of the two smaller angles is less than the proportion of the largest angle, then the triangle is an obtuse triangle; the sum of the proportions of the two smaller angles is equal to the proportion of the largest angle (the two acute angles are mutually complementary) , then the triangle is a right-angled triangle; if the sum of the ratio of the two smaller angles is greater than the ratio of the largest angle, then the triangle is an acute-angled triangle.

Knowledge points: The relationship between the two acute angles of a right triangle

Summarize

Flexible use of the triangle interior angle sum theorem, combined with the definition of the height of a triangle and the angle bisector, is a common method to find the degree of the relevant angle.

Sum of interior angles theorem of triangles PPT, Part 3 content: Class summary

When using the angle sum theorem of a triangle to find the measure of an angle, we often combine the angle bisectors of the triangle, the height of the triangle, the relationship between supplementary angles, supplementary angles, opposite angles to the vertex angles, and the relationship between the sum and difference of the angles. You can also use the equivalent series of equations in the question to solve it.

Keywords: Free download of Beijing Normal University edition eighth-grade mathematics PPT courseware for the first volume, PPT download of the sum of interior angles theorem of a triangle, PPT download of the proof of parallel lines, .PPT format;

For more information about the PPT courseware "Proof of Parallel Lines and the Sum of Interior Angle Theorem of Triangles", please click on the Proof of Parallel Lines PPT Theorem of Sum of Interior Angle of Triangles PPT tag.

"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 2):

"Sum of Interior Angles of Triangles Theorem" Proof of Parallel Lines PPT Courseware (Lesson 2) Part One Content: Learning Target Definition of Exterior Angle of Triangle Relationship of Exterior Angle of Triangle Sum of Exterior Angle of Triangle... ... Sum of Interior Angle of Triangle Theorem PPT, Part 2: Feelings...

"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...

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Update Time: 2024-08-16

This template belongs to Mathematics courseware Beijing Normal University Edition Eighth Grade Mathematics Volume 1 industry PPT template

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