Scott has verified that the window is a rectangle. Side AB is half of the length of side AC. If the perimeter of the window is 120 ft., what are the lengths of side AB and side AC?

Answer:
AB = 20 ft
AC = 40 ft
Step-by-step explanation:
==>Given:
Rectangular window ABCD, where,
side AB = ½ of side AC
Perimeter = 120ft
==>Required:
Length of side AB and side AC
==>Solution:
Let AB = x
If x = ½ of AC
AC = 2x
Perimeter = 2(AB + AC)
Thus,
120 = 2(x+2x)
120 = 2(3x)
120 = 6x
Divide both sides by 6 to solve for x
120/6 = x
20 = x
AB = x = 20 ft
AC = 2x = 2(20) = 40ft