Perimeter of 12" by 8" = 12+8+12+8 = 40 inches.
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4 +4 = 8 and 8+8 = 16 16+4 =20the perimeter would equal 16
28 feet
2 x (8 + 6), ie 28 ft.
A rectangle measuring 12 inches by 8 inches has a perimeter of 40 inches, since 12 + 12 + 8 + 8 = 40 inches.
The perimeter would be (12 + 8) x 2 which is 40.