Which one of the four trapezoids is not similar to the other three?

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answer is D.

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Detailed Solution

Given the figure,
Question Image

We know that two shapes are similar if the only difference is size (and possibly the need to turn or flip one around).
Trapezoid B is similar to trapezoid A because it has the same shape but has been rotated.
Trapezoid C is similar to trapezoid A because it has the same shape but a different size.
Only Trapezoid D has a different shape to the other three.
Hence option 4 is the answer.

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