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Isosceles Trapezoid and Rotational Symmetry
Look at the isosceles trapezoid below. A quadrilateral with exactly two sides parallel and two sides congruent is called an isosceles trapezoid. It will rotate and show you how many places it can stop and look like a the original trapezoid. You can tell that it is moving in a clockwise manner by finding the corner that is marked for your convenience.
Since this polygon has to go all the way around to its first position to land on itself it does NOT have rotational symmetry. A figure must land on itself more than once in 360 degrees of turn to have the property of rotational symmetry.
[Back to Pattern Blocks]
[Rotational Symmetry Home Page] [Hub Caps] [Activities] [Extensions] [Challenge] [Symmetry Home Page]
These symmetry pages have been brought to you by Nancy Powell, a TeachNet Web Mentor from Bloomington High School, Bloomington, IL.
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