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Modules Open College - e-Learning Content Library
Quadrilateral. Movie

The movie demonstrates various examples of quadrangles: square, rectangle, trapezium, parallelogram and rhomb.

Depending on type of light source and its location the rectangle's shadow may transform to various forms. Thus a side point light source casts a square's shadow like trapezium. If a light source gives parallel rays then a shadow from the square is a parallelogram.

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