Two rectangles are similar if and only if their corresponding sides are in proportion.
If 4/5 = 10/8, then (4)(8) = (5)(10), because in any proportion the product of the means equals the product of extremes. Since 32≠ 50, the corresponding sides of those rectangles are not in proportion, so that rectangles are not similar.
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Oh, dude, 41 can make a bunch of rectangles, like seriously. You got your standard 1x41 rectangle, then there's the 2x20, 4x10, and even the 5x8 rectangle. So yeah, 41 can make quite a few rectangles if you're into that kind of thing.
Yes, it's just doubled in size.
576
Similar polygons have congruent angles and the same shape (but not necessarily the same size). Since the shape of a square and a rectangle is different from the shape of a trapezoid, they are not similar to it.
they have four equal sides