Hey there!
The rectangle has a width of 10 centimeters and the length is 4 times the width . . .
Width = 10
Length = 10 x 4
10 x 4 = 40
The length is 40 cm
10 + 10 = 20
40 + 40 = 80
20 + 80 = 100 <-------
The perimeter of the rectangle is 100 cm.
Hope this helps you.
Have a great day!
