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 Everyday Examples
 Isosceles Trapezoid:  A trapezoid whose non-parallel sides are exactly the same length.
Trapezoidal shapes are often used in building arches, where each block or stone supports, and is supported by, the pieces above and below it. Another use is in binoculars in which the magnifying lenses invert the image. Trapezoidal prisms are used to turn the inverted images right side up again.