l=4.2w=4.2
The perimeter of a rectangle is equal to the sum of all sides of the rectangle.
length+length+width+width=2⋅(length)+2⋅(width)
Substitute the values of the length l=4.2 and width w=4.2 into the formula for the perimeter of a rectangle.
2⋅4.2+2⋅4.2
Multiply 2 by 4.2.
8.4+2⋅4.2
Multiply 2 by 4.2.
8.4+8.4
8.4+8.4
Add 8.4 and 8.4.
16.8
Find the Perimeter rectangle (4.2)(4.2)
