Solve problems involving the perimeters of plane shapes, eg find the dimensions of a rectangle, given its perimeter and the length of one side

1. All around the garden: Addition and subtraction of distance measurements
2. The Area Stands - dimensions of rectangles with the same area
3. Boundary Rider 2 - calculate side length given area and one side
4. Contained in the Circus - calculate dimensions of rectangle to give largest area given perimeter
5. Tightly Bound - find smallest perimeter of rectangle given area