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Math Help - Shapes

  1. #1
    Need-Help
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    Shapes

    Okay I was wondering if anyone could help me out with this one:

    Which of these polygons always have reflectional symmetry?

    A. Parrallelograms and rectangles
    B. Parrallelograms and trapezoids
    C. Rectangles and trapezoids
    D. None of the above


    I am not sure I think it is A but want to know if my answer is wrong or correct.
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  2. #2
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    earboth's Avatar
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    Quote Originally Posted by Need-Help View Post
    Okay I was wondering if anyone could help me out with this one:

    Which of these polygons always have reflectional symmetry?

    A. Parrallelograms and rectangles
    B. Parrallelograms and trapezoids
    C. Rectangles and trapezoids
    D. None of the above


    I am not sure I think it is A but want to know if my answer is wrong or correct.
    Parallelograms are allways symmetric about a point (= midpoint of the diagonals) and rectangles are a special form of parallelograms and therefore they are symmetric about a point too. Additionally they are symmetric about the mid-parallels, that means they are symmetric about two different axes.

    Trapezoids generally are not symmetric.

    So your answer (A) was correct.
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