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After learning all of the properties of trapezoids, rectangles, and squares, consider how much different geometry would be without them. How do you think it would affect the way you are able to solve problems?
By not being able to use the proven properties of trapezoids, rectangles, and squares, we would not be able to assume that any of the angles are right angles, or that any of their sides are equal. We would have to go back to measuring everything out by hand and would have lots of room for error.