How to evenly space table cells in Pages document?
In Pages you are able to enter the sizing/spacing for cells in a table in Pages. You are limited to entering specific measurements that is applied to all cells.

To do so go to the Tool Bar and select the Format Tab > Table Tab (have the table selected) then look to the bottom right corner of the window for where it says Row &amp;  Column Size and it will let you enter the with Height and Width. I have included a screenshot as well to help.