Step-by-step explanation:To find the perimeter of a rectangle, use the formula:Perimeter=2×(Length+Width)Perimeter=2×(Length+Width)Given:Length = 12 cmWidth = 7 cmPerimeter=2×(12+7)=2×19=38 cmPerimeter=2×(12+7)=2×19= 38 cm So, the perimeter is 38 cm.