∆ABC is similar to ∆DEF. The perimeter of ∆ABC is five times the perimeter of ∆DEF. The area of ∆ABC is 100 square centimeters. The area of ∆DEF is
square centimeters.

The ideal mechanical advantage of a machine reflects the increase or decrease in force there world be without friction, it is always greater than the actual mechanical advantage because all machines must overcome friction. true false