1. which of the following transformations are rigid motions?
( pick all that are needed)
a) reflection
b) dilation
c) rotation
d) translation

A) reflection   C) rotation    D) translation

Step-by-step explanation:

A rigid transformation happens when a point or object is moved, but the size and shape remain the same. There are four kinds of rigid transformation.

1) translation 2) reflection 3) rotation 4) glide reflection.

They all create congruent images.

But a dilation is a non rigid motion.

A dilation is a transformation that creates an image that is the exactly same shape as the original, but have a different size.