The video tutorial explains how to prove that the area of a square formed by four right-angled triangles is equal to the sum of the squares of the two shorter sides of the triangle. The teacher uses Pythagoras' theorem to demonstrate this, showing that the hypotenuse of the triangle is the side of the square. The tutorial concludes with a discussion on the allocation of marks for the problem, emphasizing the application of Pythagoras' theorem in a unique context.

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