Image caption, The perimeter of this shape is: 6 cm + 8 cm + 3 cm + 7 cm + 9 cm + 15 cm = 48 cm. The missing length needs to be added to 7 cm to create the longest length, 12 cm. 7 cm ...

Image caption, The perimeter of this shape is: 6 cm + 8 cm + 3 cm + 7 cm + 9 cm + 15 cm = 48 cm. The missing length needs to be added to 7 cm to create the longest length, 12 cm. 7 cm ...