Question

A dilationwith center O maps R to R'. What is the scale factor of the dilation?



Radio button to select the answer below
A.


Radio button to select the answer below
B.


Radio button to select the answer below
C.


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D.

Answer 1

I don't have the diagram or the numeric choices, so I can't pick A–D. Give me the diagram or the coordinates/lengths and I will choose.

How to find the scale factor:
- Measure OR (distance from center O to R) and OR' (distance from O to R').
- Scale factor k = OR' / OR.
- If R' lies on the same ray from O through R then k is positive; if R' is on the opposite side of O from R then k is negative (some texts restrict k to positive).

Example: if OR = 4 and OR' = 10 then k = 10/4 = 2.5.

Send the picture or the numeric distances (or the four answer choices) and I’ll pick the correct letter.