Answer:
you are correct.
if you multiply the base and height with 3
height: 3 * 4 = 12
base: 3 * 8 = 24
area = 1/2 * base * height = 1/2 * 24 * 12 = 144
change in dimensions: 3 * 1 = * 3
change in area is (144/16) = 9
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