"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT Courseware 2 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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"Sum of Interior Angles Theorem of a Triangle" Proof of Parallel Lines PPT Courseware 2
learning target
1. Use jigsaw puzzle to verify the sum of the interior angles of a triangle.
2. Be able to understand and master the proof process of the sum of interior angles theorem of a triangle.
3. Be able to flexibly apply the triangle interior angle sum theorem to perform simple calculations and reasoning proofs.
Create situations to stimulate interest:
There are three interior angles in a right triangle. Usually, the three brothers are very united. But one day, the second child suddenly became unhappy and lost his temper. He pointed at the eldest child and said: "Why do you have the greatest degree? I want to fight with you too." The same size!" "No!" said the eldest brother: "This is impossible, otherwise, our family will no longer be able to surround it..." "Why?" The second eldest child was puzzled.
Students, do you know the reason?
Theorem: The sum of the three interior angles of a triangle is 180°
discuss
Can there be two right angles in a triangle?
Can a triangle have two obtuse angles?
Can all three interior angles be less than 600?
New knowledge application
(1) In △ABC, ∠A=35°, ∠B=43°, then ∠C=______.
(2) In △ABC, ∠C=90°, ∠B=50°, then ∠A =______.
(3) In △ABC, ∠A=40°, ∠A=2∠B, then ∠C =______.
What did you learn in this lesson? ? ?
1. Theorem of the sum of the interior angles of a triangle: The sum of the three interior angles of a triangle is equal to 180°
2. Through thinking, exploring, and summarizing the theorem of the sum of the interior angles of a triangle, we found that to prove that the sum of the three interior angles of a triangle is equal to 180°, it needs to be converted into: the sum of the interior angles of a straight angle or two straight lines parallel to the same side is equal to 180°.
3. In the theorem proof of the sum of the interior angles of a triangle, the essence of adding auxiliary lines is to move the angles through parallel lines.
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For more information about the PPT courseware "Proof of Interior Angles of Triangles and Parallel Lines Theorem", please click on the Proof of Interior Angles of Triangles and Parallel Lines Theorem ppt ppt tag.
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