Area & perimeter of irregular rectangular shapes | K5 Learning Below are our grade 5 geometry worksheets on finding the area and perimeter of irregular rectangular shapes using customary measurement units (inches, feet, yards). Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4 Worksheet #5 Worksheet #6 5 More Similar: Area / perimeter of rectangles Area / perimeter of rectangles (metric) What is K5?