Question

Triangle DEF is dilated to form triangle D'E'F' with center of dilation at the origin.

Answer 1

Answer:
`3`

Explanation:

The rule for dilating a figure by a scale factor of
`k` centered at the origin is
`(x,y) \to (kx, ky)`.

Using the coordinates of
`D` and
`D'`, we see that
`k=3`.