Скачать или смотреть CLASS 9 || THEOREM 21 || MATHEMATICS || Ganit prakash (page 151) ||

This video explains Theorem 21 from the Ganit Prakash textbook, which deals with the properties of a line drawn through the midpoint of a side of a triangle, parallel to another side.


The video provides a step-by-step proof of the theorem, which states that if you draw a line from the midpoint of one side of a triangle, parallel to a second side, then that line will bisect the third side. It also proves that the length of the line segment created is half the length of the second side.
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​00:00 - Introduction to Theorem 21.
​00:11 - Explanation of the problem statement.
​00:42 - The first objective of the proof is stated.
​01:32 - The second objective of the proof is introduced.
​01:48 - The construction for the proof is detailed.
​02:13 - The proof begins by establishing the congruence of two triangles.
​08:37 - It is proven that a quadrilateral within the construction is a parallelogram.
​10:55 - The first objective of the proof is completed.
​12:02 - The second objective of the proof is completed.
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