Lesson 1, Topic 1 In Progress Developing and Applying a Formula for Determining Perimeter of Rectangle and Square. Charles Agyemang The rectangle above has its 2 lengths to be 4cm each and the 2 widths 2cm each. Calculating the perimeter=4cm+2cm+4cm+2cm= 2x4cm+2x2cm= 8+4=12cm. Hence Perimeter = length + length + width + width. P = 2L + 2W
