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