Are stretches and compressions rigid or non-rigid transformations?

The rigid transformations are reflection, rotation, and translation. The image from these transformations will not change its size or shape. A non-rigid transformation can change the size or shape, or both size and shape, of the preimage. Two transformations, dilation and shear, are non-rigid. Hope this helps you!

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im not sure

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).