(a) Find the length of the boundary of square D.
(b) 8 squares of side 1 cm are cut out of the square D. Now it looks like shape E. What is the length of the boundary of shape E?
(c) The boundary of this
![](https://search-static.byjusweb.com/question-images/img/study_content/content_ck_images/images/106145_iii.png)
is _____ + _____ + _____ + _____
Can we also say that the boundary is 4 × 1 cm?