- 2a+2b: Rectangle-Perimeter(Use variables a and b for sides)
- 2a+2b: Parallelogram-Perimeter(Use variables a and b for sides)
- 4s: Square-Perimeter(Use variable s for side)
- 4s: Rhombus-Perimeter(Use variable s for side)
- a+b+c+d: Trapezoid-Perimeter(Use variables a,b,c, and d for sides)