Posted by **Anonymous** on Monday, May 14, 2012 at 9:22pm.

if length and width of a 3in. x5 ln. photo are tripled what scale factor relates the area 3,9,12,27 i answered 27 is this correct i tried 9 but got no answer

- math 8th grade -
**Jai**, Monday, May 14, 2012 at 9:43pm
recall that area of rectangle (shape of the photo) is given by

A = length * width

substituting,

A (original) = 3 * 5 = 15

if we triple both length and width,

new length = 3 * 5 = 15

new width = 3 * 3 = 9

thus,

A (new) = 15 * 9 = 105

to get the ratio, we divide the new area by original area:

105 / 15 = 9

hope this helps~ :)

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