Which transformations will produce similar, but not congruent, figures?Triangle PQR is reflected across the x-axis and then rotated 90° clockwise to form triangle P"Q"R" .​ Triangle PQR ​ is rotated 90° clockwise and then reflected across the y-axis to form ​ triangle P"Q"R" ​ .​ Triangle PQR ​ is rotated 180° counterclockwise and then translated 11 units left to form ​ triangle P"Q"R" ​ .​ Triangle PQR ​ is reflected across the y-axis and then dilated by a scale factor of 6 to form ​ triangle P"Q"R" ​ .

Answer: Choice D

The reason why is because any time you have a dilation with a scale factor other than 1, then the resulting figure is either bigger or smaller compared to the original. If two figures of the same shape are different sizes, then they cannot be congruent. The other transformations of rotation, reflection and translation are what we call rigid transformations. They preserve the size leading to keeping the figures congruent.