## Geometry: Common Core (15th Edition)

Set up a ratio of the corresponding sides. 12:9 Reduce the ratio by dividing each number by 3. 4:3 The ratio of the perimeter is the same as the ratio of corresponding sides. 4:3 = 4:3 The ratio of the areas is the square of the ratio of corresponding sides. $4^{2}$:$3^{2}$=16:9