Area: Width x lenght
Perimeter = 2 width + 2 lenght
Replacing with the values given:
Area = 6x
Perimeter = 2(6)+2x
Since both perimeter and area are equal:
6x = 2(6)+2x
Solve for x:
6x = 12 + 2x
6x-2x =12
4x= 12
x= 12/4
x= 3
Replace x in the equations:
Area = 6x = 6 (3)= 18
Perimeter = 2(6)+2x = 12+2(3) = 12+6 =18
Correct option:
C.18