What is the ratio, r when considering a rectangle with width 4 and length 5? What about a rectangle with width 8 and length 10? What about any multiple of such sides? After exploring these ratios we can conclude that:

**All 4x5 (8x10) rectangles have r = 16. 2**

**Prove that this is true by calculating the ratio, p^2/a**

**Use:**

**Perimeter = 2L+2W (L=5, W=4)****Area = L*W****Ratio = (2L+2W)^2/L*W**

**Use this calculator:**